2) The source of fuel used to make the sun shine is hydrogen
Answer: c
Answer:
arid
Explanation:
anywhere lying 30 degrees north or south latitude is most likely to be an arid climate
Answer:
A categorical grant is used for a specific purpose, or category, for state or local spending. (Ex: natural disaster, airport building, crime fighting) that depends on state's population. Block Grants are given for general purposes that the states can use as they see fit (welfare, public health).
There are two<span> basic </span>types of metamorphic rocks<span>. Foliated </span>metamorphic rocks<span> such as gneiss, phyllite, schist, and slate have a layered or banded appearance that is produced by exposure to heat and directed pressure.</span>
Answer:
This is the best explanation for why there is such a small amount of phosphorus that moves into aquatic systems:
1. Phosphorus is highly stable in the atmosphere and remains there for long periods of time.
Explanation:
The phosphorus first cycle is the process by which the phosphate ion passes in very small amounts through the lithosphere from volcanic aeorosols, then to the hydrosphere, where it stays from 20,000 to 100,000 years in the ocean, and finally to biospherere, where rain and erosion helps washing the phosphorus from the rocks into the soil. So, raining is the beginning of the phosphorus´s second cycle, so it is also, the slowest one of the matter cycles that is why the natural total background phosphate levels in several bodies of freshwater range from 0.005 to 0.05 mg/L. Phosphorus remains mostly on land and in rock and soil minerals.
Although abundant on our planet´s sedimentary rock crust and in human body, phosphorus to commercialize is only found in minerals therefore, phosphates mining activity and calcium heating is the only way to get it in its pure elemental form. It is an essential nutrient for plants and animals and a big percentage of the mined phosphorus is used to make fertilizers.
