Ch. 2 Planet Earth Review

Earth's water supply is mostly made up of _______________.

• groundwater

• freshwater

• runoff

• salt water

The theory of continental drift states that ________________.

• mountains and valleys are being formed

• sediment is moving to another place

• Earth's continents are shifting

• Earth is rotating on its axis

Erosion is caused by which of the following? (multiple answers)

• water

• earthquakes

• wind

• ice

Earth's saltwater covers _______ percent of the Earth's surface.

• 72

• 3

• 97

• 50

Which of the following is most likely a cause of water pollution?

• river water producing electricity

• heavy rainfall causes flooding

• chemicals from a factory

• groundwater not being replaced

What are large land masses that make up part of Earth's crust?

• valleys

• mountains

• continents

• plate tectonics

When two oceanic plates collide, what type of plate boundary is occurring?

• divergent

• convergent

• transform

TRUE OR FALSE: All tectonic plates are the same size.

• TRUE

• FALSE

What percentage of Earth's water supply comes from surface water?

• 70%

• 50%

• 12%

• 1%

Most of the Earth's freshwater supply is locked up in ______________.

• groundwater

• lakes and rivers

• ocean trenches

• glaciers