http://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-landforms/rock-cycle.htm
Phosphorous is necessary for all life processes. Phosphate is part of ATP (adenosine triphosphate) the energy molecule that is a product of cellular respiration.
Phosphorous is released from rocks through weathering, a stage in the rock cycle. You will complete the weathering lab, looking at the effect of temperature on the weathering of limestone (represented by calcium carbonate tablets). Questions 1-8 on page 5 of the Global Science Textbook need to be answered. Remember, experimental design includes: independent variable, dependent variable, and the control. Make sure you talk about safety.
DOL: Write a quick expository essay explaining how the rock cycle works. You should start and end in the same place. Make sure you explain at which stages you would find sedimentary, igneous, and metamorphic rock.
Answer the following for homework:
1.The reservoir of the element phosphorus exists in various rock and soil .
2. Plants absorb phosphate from the or solution.
3. Phosphate is first assimilated into organic compounds as phosphate and then passed to various other organisms through the food chain.
4. At any point on the food chain, an organism may use organic phosphorus in respiration. when this occurs, the phosphate is released back to the environment in .
5. Humans disrupt the phosphorus cycle by and .
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