Lesson 1: Earth’s water on the move

Fill in the blank and use the words in the box.
1. Earth is often called the __________ planet because so much of its surface is covered by water.

• water

• rock

• fire

• air

When viewed from space, Earth appears mostly __________ and white because of water in the oceans and clouds.

• blue

• green

• red

• yellow

Fill in the blank and use the words in the box. 3. Water covers about __________ of Earth’s surface.

• 71%

• 50%

• 85%

• 30%

Fill in the blank and use the words in the box. About __________ percent of Earth’s water is __________, and only __________ percent is __________.

• 97%, salt water, 3%, fresh water

• 70%, fresh water, 30%, salt water

• 50%, salt water, 50%, fresh water

• 80%, fresh water, 20%, salt water

Fill in the blank and use the words in the box. 5. Most of Earth’s water is stored in the __________, while __________ and ice sheets hold most of the frozen fresh water.

• oceans, glaciers

• lakes, rivers

• rivers, ponds

• ponds, lakes

Fill in the blank and use the words in the box. The continuous movement of water on, above, and below Earth’s surface is called the water __________.

• cycle

• stream

• layer

• current

Fill in the blank and use the words in the box. 7. Water changes many times as it __________ through the cycle — for example, through __________, __________, and __________.

• moves, evaporation, condensation, precipitation

• flows, melting, freezing, sublimation

• travels, filtration, absorption, transpiration

• circulates, erosion, deposition, infiltration

Fill in the blank and use the words in the box. 8. The __________ contains water in its invisible gaseous state.

• atmosphere

• ocean

• mountain

• forest

Water flows downhill or seeps underground because of the force of __________.

• gravity

• friction

• magnetism

• electricity

Fill in the blank and use the words in the box. 10. __________ is a force of attraction, or __________, between two objects.

• Gravity, pulling

• Magnetism, pushing

• Electricity, repelling

• Friction, sliding