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.
Answer:
Correct answers are:
1.The country is located on the Iberian Peninsula
2.The Pyrenees Mountains separate Spain from France and the rest of Europe.
3.Most of Spain is occupied by a large plateau called the Meseta.
Explanation:
Option 1 is correct as Spain is one of two countries that is located on this Peninsula. The other one is Portugal.
Option 2 is correct as these mountains are stretching across the Iberian Peninsula and are forming natural border towards the rest of Europe.
Option 3 is also correct as Meseta covers more than 200 000 square km of Spain.
India was colonized in 1947.
On June 15, 1947, the British House of Commons passed the Indian Independence Act, or Mountbatten Plan, which divided India into two dominions, India and Pakistan.
A cliff collapse could affect the environment by exposing new rock (previously covered by the cliff) to the elements, which could result in runoff of a different nature when it rains. Additionally, the cliff would collapse upon whatever life/features existed at the base of the cliff. One of the most drastic effects could be the shaking of the earth. Cliff failures can result in earthquakes or, if the cliff collapses into a large body of water, massive tsunamis which radically impact coastal environments.
Answer:
b. False
Explanation:
The trenches are not physical features that occur on places where there are subduction zones between the tectonic plates, but they do not appear on places where there are divergent plate boundaries. The trenches are simply very deep, narrow, ocean beds, that have very steep sides.
The divergent boundaries are the opposite boundaries from where the trenches occur. These boundaries occur between tectonic plates that move away from each other. The typical physical feature at this type of plate boundaries are the mid-ocean ridges (if it occurs in an ocean), or the rift valleys (if it occurs on land).
This type of boundary produces new crust on Earth, and they also can split a tectonic plate into two separate plates, or even give rise to a new continent.
