Bell Ringer 10/26/09 I am a producer in an ecosystem. Who/What am I? Core Content SC-05-2.3.1 Students will: ｷ describe the circulation of water (evaporation and condensation) from the surface of the Earth, through the crust, oceans, and atmosphere (water cycle); ｷ explain how matter is conserved in this cycle. Water, which covers the majority of the Earth’s surface, circulates through the crust, oceans, and atmosphere in what is known as the water cycle. DOK 2 Today’s Agenda Complete Bell Ringer Discuss bell ringer I can Notes Assignment I can I can describe the carbon cycle. I can explain why the carbon cycle is important to humans. What is the water cycle? condensation precipitation watershed transpiration The continuous movement of water between Earth’s surface and the air is the water cycle. evaporation runoff groundwater All water on Earth is recycled constantly. What is the carbon cycle? combustion (human-made and natural) CO2 in air photosynthesis dissolved CO2 in water respiration decomposition coal natural gas marine plankton remains oil rock The carbon cycle is the continuous exchange of carbon among living things. What is the nitrogen cycle? The nitrogen cycle is the continuous trapping of nitrogen gas into compounds in the soil and its return to the air. nitrogen gas in air (N2) nitrogen fixation denitrification decomposition ammonia absorption nitrate nitrite What roles do plants play in the water, carbon, and nitrogen cycles? Water cycle: Plants release water to the atmosphere through transpiration. Carbon cycle: Plants turn carbon dioxide into carbon-rich foods. Nitrogen cycle: Plants play a key role in housing bacteria that fix nitrogen and transform it into a usable form that other plants can build with. Homework due on Tuesday Diagram the carbon cycle. In which part of the carbon cycle is carbon trapped for the longest time? Write a brief summary of the carbon cycle. (1-2 paragraphs) Exit question Explain why the carbon cycle is important.