What makes the phosphorus cycle different from the carbon cycle?
a. phosphorus is abundant throughout the biosphere, and carbon is not.
b. unlike phosphorus, carbon can only be used once, and then the cycle stops.
c. phosphorus is not abundant in the atmosphere, it comes mostly from the land and ocean.
d. phosphorus relies on phosphorus-fixing bacteria to make it usable by plants.

Which sentence best expresses the differing opinions of these two book reviews?

In 2015, about ten percent of total u.s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel