Water's Role on Earth Review

What is the only substance on earth that exists as a solid, liquid and gas?

• CO2

• Silicate

• Water

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What elements does water contain?

• carbon and oxyge

• silicon and iron

• hydrogen and oxygen

• oxygen and sulfur

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What is the "breaking down of earth materials" by water, wind or gravity?

• slumping

• weathering

• combustion

• precipitation

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Approximately what percentage of the Earth's surface is covered by water?

• 50%
• 71%
• 90%
• 30%

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Water molecules are ______ because different sides of the molecule have different charges that do not cancel out.

• magnetic
• neutral
• polar

Which statement about water is true?

• It is more dense as a solid than as a liquid
• It is more dense as a liquid than as a solid
• It is the same density as a solid and a liquid

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What is this image showing?

• carbon cycle
• rock cycle
• water cycle

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Because water is very good at dissolving many different substances it is often called the universal _______.

• solute
• sulfur
• solvent
• solution

What type of rock is formed by the crystallization or solidification of molten rock?

• igneous rock
• sedimentary rock
• metamorphic rock

What type of rock is formed when existing rock is changed by extreme pressure and temperature?

• igneous
• metamorphic
• sedimentary