Unit 2-7th grade

On a cold morning, Pierre observed that the grass looked wet. The picture below shows what Pierre observed. Which term best describes what Pierre observed?

• Dew

• Fog

• Mist

• Snow

Which process changes water into a gaseous state?

• Deposition 
• sublimation
• precipitation 
• condensation

Tai grows plants in a container called a terrarium, as shown below. He keeps the terrarium on a sunny windowsill.
The terrarium is closed, so Tai cannot add water to the plants. However, the plants have enough water to grow. Which of these statements best explains why the plants always have enough water?

• The air cannot hold all of the water vapor.
• Water is unable to evaporate from the soil.
• The plants take up water and store it in their stems and leaves.
• Energy from the sun cycles water through the soil, the plants, and the air.

After a day of rain, Samuel observed that a field on his family’s farm was covered in water. The next morning, the field appeared dry. Which of these statements is the least likely explanation of what happened to the water?

• The water was absorbed into the soil.
• The water seeped through the ground.
• The water evaporated into the atmosphere.
• The water slowly trickled to lower ground as runoff.

A weather report stated that rain was likely with some snow and hail also possible. Which statement is not true about rain, snow, and hail?

• They all form in clouds.
• They are all precipitation.
• They are all the same state.
• They are all made of water.

Which term is used to identify the area of land that is drained by a river system?

• a divide
• an aquifer
• a tributary
• a watershed

Which of the following is not able to become runoff?

• river water
• ocean water
• precipitation 
• groundwater

Which of the following characteristics of a watershed would act to reduce erosion?

• large floodplain areas
• soil with a high porosity
• a large number of lakes
• channels with a low gradient

The diagram below shows a body of water below Earth's surface.To what does the "X" in the diagram refer?

• a divide
• a floodplain
• a watershed
• a water table

Which type of soil can retain the greatest amount of water?

• one that has low porosity
• one that has high porosity
• one that has low permeability
• one that has high permeability