The law of conservation of matter states that matter can be neither created nor destroyed. It can, however, be recycled. Earths crust is recycled by the interactions of tectonic plates and convection in the mantle. Describe the role of the plate tectonics in conservation of matter on earth?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.