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.
Superposition and geologic timescale support the theory because of the changes in features in index fossils of diverse periods are presumed to be caused by evolution, and the existence of different organisms in different periods is then used to support biological evolution.
Answer:
I hope you meant the earth core, if so here it is. if not let me know and i will do my best to correct it.
Explanation:
1.hot, dense ball of (mostly) iron.
2.has a radius of about 1,220 kilometers (758 miles)
3.in the inner core is about 5,200° Celsius (9,392° Fahrenheit)
4.pressure is nearly 3.6 million atmosphere
Hope this helped!!!
#10 is incorrect, the correct answer is Korea.
#11 is incorrect, the correct answer is Japan.
#13 is incorrect, the correct answer is Communist.
#14 is incorrect, the correct answer is Collective Farms.
#15 is incorrect, the correct answer is Ganges River.
As far as I know, all other answers are correct.
Feel free to ask for explainations.
How do scientists explain the fact that some land-forms that are far apart and separated by oceans appear to be related?
A. Earthquakes
B. Continental Drift
C. Volcanic Eruptions
D. Erosion
