grade 8 quiz

1.What is the role of phytoplankton in the carbon cycle?

• a.To take in and release carbon dioxide gas
• b.To collect carbon in the liquid
• c.To build up and turn into chalk

2. What substance is produced by some types of phytoplankton when they take in carbon dioxide gas?

• a.Nitrogen
• b.Calcium carbonate
• c.Oxygen

3. What is the primary source of carbon for plants?

• a.Atmospheric carbon dioxide
• b.Decomposition of other organisms
• c.Bodies of water

4.How can carbon enter the environment?

• a.Through photosynthesis
• b.From combustion of fuels
• c.From decomposition of other organisms

5.What are fossil fuels?

• a.Fuels made from decomposed organisms
• b.Fuels made from atmospheric gases
• c.Fuels made from animal matter

6. As water vapor rises into the atmosphere, it:

• a.Becomes cooler and condenses into liquid water
• b.Becomes cooler and sublimates into solid water
• c.Becomes warmer and evaporates into the air

7. Which of the following is an example of precipitation in the water cycle?

• a.Plants releasing moisture through transpiration
• b.Animals exhaling water vapor into the atmosphere
• c.Rain, snow, sleet, or hail falling from clouds to Earth's surface

8. When liquid water changes into a gas called water vapor, it is called:

• a.Precipitation
• b.Condensation
• c.Evaporation

9.Which process involves a change of state from gas to liquid in the water cycle?

• a.Condensation
• b.Precipitation
• c.Evaporation

10. Which of the following is true about the temperature as water vapor rises into the atmosphere?

• a.The temperature becomes cooler
• b.The temperature becomes much warmer
• c.The temperature becomes much colder