Ch. 4 Cycles in Ecosystems

I am the continuous exchange of carbon among living things.

• Nitrogen cycle
• Carbon cycle
• evaporation
• compost

I am water that sinks beneath the ground and collects in tiny holes in soil and rock.

• groundwater
• runoff
• waterfall
• rain

I am the continuous changing of nitrogen gas into compounds in the soil and its later release back to the air.

• condensation
• carbon cycle
• nitrogen cycle
• precipitation

I am precipitation that flows over the land's surface into rivers and lakes and is not absorbed into the ground.

• waterfall
• runoff
• precipitation
• evaporation

I fall to Earth's surface as rain, snow, sleet, or hail.

• Rain
• evaporation
• runoff
• precipitation

I am the changing of liquid into a gas.

• carbon cycle
• nitrogen cycle
• evaporation
• precipitation

I am the changing of a gas into a liquid as the gas cools.

• precipitation
• condensation
• compost
• groundwater

I am a mixture of decayed plant and animal material that can be used as fertilizer.

• runoff
• trash
• compost
• groundwater

Succession that occurs when there is no soil and where few, if any, living things exist is:

• pioneer species
• primary succession
• secondary succession
• succession

Establishment of the first living community to develop in an area that used to be lifeless is called:

• climax community
• endangered species
• extinct
• pioneer community