What is the main advantage of using dams to produce electrical energy?
They can be built near most cities.
They do not produce much pollution.
They are inexpensive to build.
They do not damage wildlife homes.
Water any container in which the soil feels dry
Water all of the containers the same amount at the same time
Water any of the plants that seem to be growing more slowly than the others
Water the plants in compacted soil more than those in uncompacted soil
Which planet is often called "Earth's twin" because it is similar in mass and diameter to the Earth?
Mars
Mercury
Venus
Pluto
the heat rising from the inner core is melting the outer core
there is more water in the outer core and it dilutes the materials
the outer core is farther from the center, and there is less gravity holding it together
the pressure from all of Earth's layers keeps it in a solid state
A light-year measures--
brightness
distance
radiation
time
Which vertebrate did not live during the time of the dinosaurs (the Mesozoic Era)?
Land breezes and sea breezes are created by the differences in--
the Earth's tilt on its axis
solar radiation reaching the Earth's surface
the heat capacity between water and land
the living organisms occurring in the land and sea
Which of the following minerals found in the northern Piedmont province is known as "fool's gold"?
Pyrite
Hematite
Galena
Limonite
cold air moving in the direction the triangles point
cold air moving opposite the direction the triangles point
warm air moving in the direction the triangles point
warm air moving opposite the direction the triangles point
Laser beams
Doppler radar
Sonar
Seismology
Which diagram correctly shows wind motion between pressure areas?
During droughts, lack of rain can lead to wells drying up. This is because the drought has lowered the--
water table
water trough
zone of aeration
zone of porosity
Which of these is the best evidence that the Earth's crust has undergone some major changes?
The location of major rivers
The amount of available water on Earth
The presence of marine fossils in mountain rock
The arrival of the vernal equinox
5,700 years
11,400 years
17,100 years
22,800 years
Black hole
Dwarf star
Main-sequence star
Stellar nebula
A
B
C
D
Of the following, the largest division on the geologic time scale is--
a year
an epoch
an era
a period
Saturn's volume is 762 times the volume of Earth, and yet its mass is only about 95 times that of Earth's mass. This is due to Saturn's--
low density
temperature
thousands of rings
distance from the sun
When placed in water, ice rises to the top of the liquid. Unlike most solids that sink when placed in their liquid forms, ice floats because--
it is colder than water
it is less dense than water
the pressure of the water holds it up
gases inside the ice make it buoyant
tension
shearing
compression
rifting
they can destroy roadways
tractors can fall into them
homes can be damaged by them
they can connect directly to the water table
Orbital velocity is the average speed of a planet moving through space in its orbit around the sun. Which of the following planets has the fastest orbital velocity?
Mercury
Jupiter
Mars
Pluto
They move along the bottom.
They stop moving as soon as they reach the ocean floor.
They are temperature-dependent.
They only occur in salt water.
In karst regions, caves are carved by the flow of water through limestone bedrock. How do the stalagmites and stalactites in the caves develop?
They are carbonate deposits formed by dripping water in air-filled cavities.
They are granite intrusions that remain behind after water dissolves the surrounding limestone.
They are crystals that grow as water hollows out the cavern.
They are carvings made in limestone by the swirling water as it hollows out the cavern.
Quartz is harder than topaz.
Calcite is harder than apatite.
Fluorite is harder than feldspar.
Gypsum is harder than talc.
Granite
Limestone
Marble
Shale
Ocean --> Evaporation --> Condensation Which of these would come next in the water cycle?
Aeration
Sedimentation
Deposition
Precipitation
The edges of moving crustal plates are often defined by--
ocean basins
frequent seismic activity
intercontinental plains
Earth's largest rivers
Chromosphere
Photosphere
Core
Corona
The topographic map that may show a hill with a volcanic crater is--
2 minutes
3 minutes
4 minutes
5 minutes
The ozone layer protects life on Earth from--
ultraviolet rays
gamma rays
infrared rays
x-rays
40 km
300 km
1200 km
2100 km
All of the following features of the ocean indicate tectonic activity except--
abyssal plains
mid-ocean ridges
seamounts
trenches
Which of these causes days and nights?
The orbit of the Earth around the sun
The revolution of the moon around the Earth
The rotation of the moon on its axis
The rotation of the Earth on its axis
1
2
3
4
focus
epicenter
fault line
shock wave
Which of these facts is the best supporting evidence that the universe is expanding?
The stars vary in chemical composition.
The galaxies are moving away from each other.
The galaxies can spin to form eddies.
The universe is filled with galaxies of different sizes.
In which of the graphs would the precipitation at ground level most likely be rain?
Jellyfish have rarely been fossilized because they--
contain no carbon compounds
are very rare animals
are generally found in oceans
have soft bodies
Which of the landforms is most likely to result when two continents collide?
Why is the surface temperature of the oceans more variable than the water near the ocean floor?
Most energy is exchanged at the surface.
Most animals live near the surface.
The water is less dense at the surface.
The salt concentration is more variable at the surface.
lower layers subjected to less pressure
erosion of the upper layers' surfaces
less deformation than in the lower block
presence of more igneous rock in the block
More often than metamorphic or igneous rocks, sedimentary rocks have--
many holes from trapped gases
large quartz crystals
numerous fossils
a glassy appearance
Virginia has large deposits of sand and gravel. These are usually found in areas where--
water once flowed
lava once covered the ground
swamps once were present
the water table was once very low
Which of these energy sources originates from a nonrenewable resource?
Solar
Geothermal
Fossil fuel
Hydroelectric
What does Pangaea mean?
It is the name of an extinct volcano.
It is the French word for volcano.
It is the name of an ancient supercontinent.
It is a huge disruption of the Earth's atmospheric circulation.
Spring
Summer
Autumn
Winter
Which of these can determine the size of grains in igneous rocks?
Amount of rare minerals
Distance from a plate boundary
Size of the volcano
Cooling rate of molten rock
Which element in Earth's atmosphere is essential for human life and is extremely rare or nonexistent in the atmospheres of other planets in our solar system?
Carbon dioxide
Hydrogen
Nitrogen
Oxygen
Which of the following is part of a valid process for supporting a hypothesis?
Altering results
Single trials
Experimentation
Limited research
The numerous rocks orbiting the sun between Jupiter and Mars are --
comets
asteroids
meteorites
satellites
What property is shared by many gemstones, such as diamonds, rubies, sapphires, emeralds, and topaz?
Extreme hardness
High specific gravity
Carbon as the primary element
Ductility
Both types are predominately pyroxene.
Both types are predominately olivine.
Achondrites contain more feldspar.
Achondrites contain more nickel-iron.
The density of a mineral is determined by its mass and --
hardness
luster
volume
shape
What causes currents in the atmosphere?
Ocean waves and currents
Pressure from the ozone layer
Solar heating of the upper atmosphere
Warm air rising and cold air sinking
I, II, IV, III
III, I, II, IV
II, IV, III, I
III, II, IV, I
The first manned-mission to land on the moon was commanded by Neil Armstrong and was called --
Apollo 11
Gemini 3
Viking 2
Mariner 7
The Marianas Trench in the Pacific Ocean is 36,160 feet below sea level. This deep oceanic trench is caused by --
swift ocean currents eroding away the ocean floor
the collapse of an empty magma chamber in a large volcano
excessive boat traffic disrupting the normal sedimentation process
two tectonic plates colliding and one plunging below the other
The sun emits energy by converting hydrogen into helium. What is this process called?
Fusion
Fission
Sunspot formation
Solar wind
One part of California is on the Pacific Plate, while the remainder of the state is on the North American Plate. The two plates are moving to the northwest at different speeds, causing one plate to slide past the other. This movement in plates creates a --
normal fault
reverse fault
strike-slip fault
thrust fault
1260 feet
1280 feet
1300 feet
1360 feet
Which of the following is not a fossil fuel?
Coal
Wood
Petroleum
Natural gas
Periodically, there are spectacular meteor showers on Earth. These showers usually occur because the Earth's orbit passes through the remains of --
a star
a comet
solar flares
the rings of Saturn
Which of these pictures shows the last in the sequence of events?
Which of these is important in the formation of clouds?
The relative length of day and night
The Coriolis effect
The melting of the polar ice caps
The cooling of air as it rises
What is usually responsible for an earthquake?
Pressure buildup within the mantle
Slippage along faults within Earth's crust
Weathering along coastlines
Force changes from the moon pulling on Earth
When Venus passes between the Earth and the sun, it is visible as a tiny black dot on the sun's bright disk. Why is Mars never visible in this same way?
The orbit of Mars is more eccentric than that of Venus.
The orbit of Mars is outside that of Earth's orbit.
Mars is too small to be seen against the backdrop of the sun.
Mars shines too brightly to be visible against the sun.
Wetlands are more prevalent in which physiographic province of Virginia?
Coastal Plain
Piedmont
Blue Ridge
Appalachian Plateau
If the polar ice caps were to melt, all of the following would occur except --
increased coastal flooding
increased sea level
decreased ocean salinity
decreased tidal action
Caves are found in Virginia's Valley and Ridge province because the area is underlain by --
granite
shale
gneiss
limestone
What is one of the major indications that the Earth's climate has varied over time?
Land forms carved by glaciers in temperate areas
Depletion of oxygen in lakes and rivers
Ocean currents
Magnetic reversals in layers of rock
Why does water move more slowly through clay than through humus?
Clay has greater permeability.
Clay has very small pore spaces.
Clay prevents capillary attraction of water.
Clay reduces evaporation rates.
1
2
3
4
Which of the following minerals, when in the form of sand, can be used to manufacture glass?
Gypsum
Diamond
Calcite
Quartz
The two most common ions found in ocean water are --
chloride and sodium
potassium and calcium
phosphate and nitrate
magnesium and sodium
If there were a slight increase in the amount of solar energy that reached the Earth, there would be an immediate increase in --
erosion
evaporation
volcanic activity
groundwater flow
Scientists use volcanoes and earthquake activity to establish --
plate boundaries
lines of latitude
borders between countries
the density of rock layers
Hightown Valley
Monterey
Jack Mountain
Bull Pasture
Which of the following properties refers to the colored powder resulting from rubbing a mineral against a harder surface?
Hardness
Luster
Cleavage
Streak
Metamorphic rocks whose minerals are arranged in layers or bands are called --
unfoliated
nonclastic
clastic
foliated
Slate is a fairly common rock that can be used for roofing shingles. What property makes it most suitable for this use?
It can be split into thin, flat layers.
It feels soft and smooth.
It is hard and brittle.
It can occur in different colors.
Mercury
Mars
Jupiter
Saturn
Heat and pressure can transform igneous rock into metamorphic rock. What processes can transform igneous rock into sedimentary rock?
Heat and pressure
Rifting and subduction
Erosion and sedimentation
Evaporation and condensation
pyrite
garnet
magnetite
topaz
40 millibars
120 millibars
200 millibars
400 millibars
Which of these is most important in determining how a rock was formed?
Color and shape
Luster and hardness
Composition and texture
Size and weight
Which of these parts of a saber-toothed cat was most likely to become fossilized?
Hair
Skin
Muscles
Jaws
Government programs to reduce acid rain have resulted in cleaner emissions from U.S. industries in recent years. As a result, the sulfate concentration in rainwater has declined significantly. But the sulfate concentration in some lakes is showing little, if any, change. Why might this be true?
There is no connection between emissions from industry and the acidity of lake water.
The sulfate in American lakes is actually coming from industries in Europe and Asia.
Sulfate that accumulated earlier in the soil is still being flushed into the lakes by run-off.
Individual industries produce fewer emissions but the amount of precipitation has increased.
Limestone is a valuable resource in Virginia because limestone can be processed to make --
plastic
steel
concrete
plywood
Lightweight and strong, the metal that has been recycled with the greatest success is --
steel
tin
aluminum
titanium
Photographs of the surface of Mars reveal the presence of sand dunes that shift over time. These dunes demonstrate the presence of what phenomenon on Mars?
Precipitation
Winds
Magnetic pole reversals
Plate tectonics
Which planet in the solar system has an orbit so eccentric that it crosses the orbit of another planet?