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The most reliable source of energy for all life on Earth is ___.
the Sun
hydroelectric power
compost
all answers are correct
cutting down a forest
energy
erosion
the greenhouse effect
Not only does it save resources to recycle metals and glass, it also takes far less ___ to make containers and other products from recycled minerals.
the Sun
hydroelectric power
compost
all answers are correct
cutting down a forest
energy
erosion
the greenhouse effect
Used paper, grass clippings, and vegetable scraps can be turned into soil-enriching ___.
the Sun
hydroelectric power
compost
all answers are correct
cutting down a forest
energy
erosion
the greenhouse effect
Rain can cause water pollution when it washes ___.
the Sun
hydroelectric power
compost
all answers are correct
cutting down a forest
energy
erosion
the greenhouse effect
Earth would be too cold to support life as we know it without ___.
the Sun
hydroelectric power
compost
all answers are correct
cutting down a forest
energy
erosion
the greenhouse effect
Which one of the following human activities would be most likely to increase soil erosion?
the Sun
hydroelectric power
compost
all answers are correct
cutting down a forest
energy
erosion
the greenhouse effect
___ is electricity produced when the energy of falling water turns the blades of a generator turbine.
the Sun
hydroelectric power
compost
all answers are correct
cutting down a forest
energy
erosion
the greenhouse effect
Wind and rain can cause ___, the movement of soil from one place to another.
the Sun
hydroelectric power
compost
all answers are correct
cutting down a forest
energy
erosion
the greenhouse effect
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