Cycling of Matter

How does the carbon cycle relate to global warming?

• Increased carbon dioxide levels in the atmosphere leads to increased temperature

• Decreased levels of carbon dioxide in the atmosphere leads to increased temperature

• Too many students farting increases the temperature in the atmosphere

Burning fossil fuel has which effect in the carbon cycle?

• It removes carbon dioxide from the atmosphere.

• It puts carbon dioxide under the ground.

• It adds carbon dioxide to the atmosphere.

• It has no effect in the carbon cycle.

________________ could increase the amount of oxygen in the air.

• Building more houses

• Burning more oil

• Paving more streets

• Planting more trees

Oxygen is a gas produced by ___________________ and used by ____________________.

• plants and animals

• photosynthesis and carbon dioxide

• animals and plants

• carbon dioxide and photosynthesis

How is the burning of fossil fuels related to global warming?

• Magic

• Fuels are hot

• Greenhouse effect

• Photosynthesis

If the plant population decreased, the amount of carbon in the atmosphere would _________.

• Stay the same

• Increase

• Decrease

As a part of the water cycle, water from Earth's surface enters the clouds and finally falls back to the ground in the form of rain. What is the correct sequence of processes water undergoes?

• Evaporation, Condensation, Precipitation

• Precipitation, Condensation, Evaporation

• Condensation, Evaporation, Precipitation

• Evaporation, Precipitation, Condensation

What are formed when water vapor condenses?

• Clouds

• Mountains

• Transpiration

• Valleys

What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition

• ammonia 

• nitrogen fixation

• denitrification