Cycles in Nature Chapter 13 Section 2 Notes

Earth’s Biosphere Earth’s biosphere contains a fixed amount of water, carbon, nitrogen, oxygen, and other materials that cycle through the environment and are reused by different organisms.

Water Cycle Water cycle – how water moves from the Earth’s surface to the atmosphere and back to the surface again. Evaporation – when liquid water changes into water vapor and enters the atmosphere. Condensation – the process of changing water from a gas to a liquid. When water drops become large and heavy enough, they fall to the ground as rain or other precipitation.

Transpiration Evaporation

Condensation

Precipitation

Runoff

The sun is warming the surface of the water. When a cloud gets full it begins to rain. This is called precipitation. The water vapor cools down and forms clouds. This is condensation. This is called The Water Cycle Water is a liquid. As the water gets warmer it changes and begins to evaporate. The warm water changes into a gas called water vapor and rises up. Water Evaporation

This keeps happening all the time. The Water Cycle Condensation Precipitation Evaporation This keeps happening all the time.

Nitrogen Cycle Nitrogen Cycle – the transfer of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere.

Nitrogen Cycle Nitrogen Cycle Video Nitrogen fixation – a process in which some types of soil bacteria can form the nitrogen compounds that plants need. Farmers replace nitrogen in the soil by growing nitrogen-fixing crops or using fertilizers that contain nitrogen compounds that plants need for growth. Nitrogen Cycle Video

Carbon Cycle Carbon cycle – how carbon molecules move between the living and nonliving world.

Carbon Cycle Producers remove carbon dioxide gas from the air during photosynthesis.

Carbon Cycle Respiration – the chemical process that provides energy for cells.

Water Cycle Internet Interactive http://www. epa Water Cycle Internet Interactive http://www.epa.gov/ogwdw000/kids/flash/flash_watercycle.html Nitrogen Cycle Internet Interactive http://www.classzone.com/books/ml_science_share/vis_sim/em05_pg20_nitrogen/em05_pg20_nitrogen.html Carbon Cycle Internet Interactive http://www.kscience.co.uk/animations/carbon_cycle.htm