Biogeochemical Cycles

What is the primary source of energy driving the water cycle?

• solar energy

• geothermal energy

• chemical energy

What human activities disrupt the natural nitrogen cycle?

• overfishing

• combustion of fossil fuels

• overharvesting crops

What human activities disrupt the natural nitrogen cycle?

• excessive fertilizer use

• driving electric cars

• driving gasoline cars

1. What is the main source of carbon for plants during photosynthesis?

• the sun

• carbon dioxide in the ocean

• carbon dioxide in the atmosphere

What natural process contributes to the sudden release of large amounts of carbon dioxide into

the atmosphere?

• photosynthesis

• volcanic eruption

• oceanic uptake

What process occurs when plants take in these nitrogen compounds from the soil through their roots?

• assimilation

• ammonification

• denitrification

The first step in the nitrogen cycle is _____.

• denitrification

• ammonification

• assimilation

Another name for the water cycle is _____.

• hydrophobic cycle

• hydrolisis cycle

• hydrologic cycle

What cycle is essential for regulating weather and climate?

• carbon cycle

• nitrogen cycle

• water cycle

Animals produce waste (feces and urine) that is rich in what?

• carbon

• nitrogen

• water