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.
D Eurasian plate and Australian plate
Explanation:
Mauryan empire, in ancient India, a state centred at Pataliputra (later Patna) near the junction of the Son and Ganges (Ganga) rivers. It lasted from about 321 to 185 BCE and was the first empire to encompass most of the Indian subcontinent.
Gupta Empire of Chandragupta II
After gaining power, Chandragupta II expanded the Gupta Empire through conquest and political marriages until the end of his reign in 413 CE. By 395 CE, his control over India extended coast-to-coast. Just like Ashoka, Chandragupta II made Pataliputra the capital of his empire and centralized the government there. He used tribute money from allies to fund government projects and salaries. Unlike Ashoka, Chandragupta did not rely on a network of spies or closely monitor the affairs of foreigners or allies. Instead, he let regions make their own decisions about administration and local governance.
Some scholars have argued that the Gupta empire was a golden age of India. The empire was marked by peace and public safety, and scholars flourished in this environment. Kalidasa, a poet of the time, is considered the greatest poet and dramatist of the Sanskrit language. Aryabhata, who lived during Gupta empire, was the first of the Indian mathematician-astronomers who worked on the approximation for Pi. Vishnu Sharma is thought to be the author of the Panchatantra fables, one of the most widely-translated non-religious books in history.
The Gupta empire ended with the invasion of the White Huns, a nomadic tribe of people from central Asia, at the end of the fifth century CE. Until the sixteenth century, there was no unifying empire; regional political kingdoms ruled India.
Answer:
B
Explanation:
The printing press allowed mass production of books that spread new scientific ideas.
