1. How is Earth's atmosphere like an ocean? How is it unlike an ocean?
2. Why do you think planes don't fly high in the stratosphere?

1. The oceans and the atmosphere are the two large reservoirs of water in the Earth's hydrologic cycle. The two systems are complexly linked to one another and are responsible for Earth's weather and climate.  The oceans help to regulate temperature in the lower part of the atmosphere.  The atmosphere is in large part responsible for the circulation of ocean water through waves and currents.  However, the ocean is primarily a liquid and the atmosphere is mostly gas, so they are different states of matter.

2. The main reason airplanes fly in the stratosphere is because this is where the least amount of turbulence is found. In addition, because the stratosphere is very dry, there are fewer clouds in this layer, making for a much smoother ride overall. It is simply the perfect layer to fly in for a number of reasons. Flying higher than the stratosphere will again cause disturbances.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

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