Water

Plants use water to ____________.

• release as a waste product

• keep predators away

• make their own food

• attract pollinators

Approximately what percentage of Earth's water is fresh water?

• 97 percent

• 71 percent

• 30 percent

• 3 percent

The streams and small rivers that feed into a main river are called __________.

• watersheds

• tributaries

• divides

• wetlands

The water in ponds and lakes is __________.

• moving

• deep

• still

• salty

As water moves slowly through a wetland, some waste materials settle out, some wastes are absorbed by plants, and silt and mud is trapped by plant roots. In this way, wetlands act as natural _______________.

• filters

• habitats

• tributaries

• artesian wells

Water that fills the cracks and spaces in underground soil and rock layers is called ___________.

• salt water

• rain water

• ground water

• water vapor

Water that falls to Earth as rain, snow, sleet, or hail is called ____________.

• condensation

• evaporation

• precipitation

• transpiration

A lake that stores water for human use is called a(n) _______.

• reservoir

• dam

• oxbow lake

• pond

People can obtain groundwater by drilling a well __________.

• above the water table

• into an aquifer

• into the unsaturated zone

• into the impermeable layer

Wetlands provide habitats for many living things because of their sheltered waters and ____________________.

• large supply of nutrients

• thick layer of mud

• lack of insects

• ability to prevent floods