Water Cycle/Stream erosion

What is essential for humans and all other organisms?

• water vapor

• rivers

• water

• icecaps

How much of Earth’s surface is covered with water?

• about a third

• about half

• more than two-thirds

• more than three-quarters

Where is Earth’s surface water NOT found?

• in the lakes and oceans

• in groundwater

• in rivers and streams

• in the atmosphere

Groundwater is water that

• flows through the rock below Earth’s surface.

• flows in streams and rivers on Earth’s surface.

• falls to Earth as rain.

• has melted from snow and the polar icecaps.

In addition to streams, rivers, lakes, oceans, polar icecaps, and groundwater, where else is water found on Earth?

• trapped in volcanoes

• sealed inside fossils

• in the tissues of all living creatures

• in mineral crystals

Water occurring as an invisible gas is called

• water vapor.

• water particulate.

• water distillate.

• water transpiration.

Where is water vapor found?

• in underground streams

• deep in the oceans

• in the polar icecaps

• in the atmosphere

Where can you find water vapor in the atmosphere?

• in clouds and fog

• in rivers and streams

• in groundwater

• in polar icecaps

An example of water changing from a solid to a liquid is

• water vapor escaping from oceans into the atmosphere.

• water vapor falling from the sky as rain.

• glaciers melting to form streams.

• puddles freezing into ice.

What is the continuous movement of water from the atmosphere to the land and oceans and back to the atmosphere?

• the hydrogen cycle

• the water cycle

• evaporation

• condensation