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.