7th grade unit 2 review

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

• dew
• fog
• mist
• snow

As water changes state, the water either absorbs or releases energy. Which of these changes of state would involve water absorbing energy?

• condensation
• deposition
• evaporation
• freezing

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 clounds
• they are all precipitation
• they are all the same state
• they are all made of water

Runoff is most like which of the following?

• a puff of steam
• a flowing stream
• a cloud in the sky
• an invisible form of water

Which of the following is not a way that water reaches Earth’s atmosphere?

• condensation
• evaporation
• sublimation
• transpiration

What causes convection currents to form in the oceans?

• surface winds
• the Coriolis effect
• continental deflection
• differences in water density

What role does heat play in the formation of convection currents?

• When water loses heat, it becomes denser and sinks.
• When water gains heat, it becomes denser and sinks.
• When water loses heat to cooler water, the cooler water becomes denser and sinks. 
• When water gains heat, it dissolves more solids and gases, becomes denser, and sinks.

Which of the following movements of ocean water has the greatest direct effect on the growth of producers?

• upwelling
• deep current
• surface current
• convection current

Which statement correctly describes a difference between gaseous and liquid water?

• Only liquid water takes the shape of its container.
• Only water vapor takes the shape of its container.
• Only liquid water expands to fill the available space.
• Only water vapor expands to fill the available space.

What percentage of water on Earth is salt water?

• 55
• 72
• 84
• 97