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swat32
3 years ago
10

How did scientists discover the age of the Earth?

Geography
1 answer:
Mandarinka [93]3 years ago
8 0
Above 500 billion years ago scientific think about Earth
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Describe the distribution of coal in india
nydimaria [60]

Answer:

Your welcome!

Explanation:

In India coal occurs in rock series of two main geological ages, namely Gondwana, a little over 200 million years in age and in tertiary deposits which are only about 55 million years old.

7 0
2 years ago
Earthshine is illumination seen during which phase of the moon?
Slav-nsk [51]
Earthshine is even more faint because the moon's "albedo" (a specific kind of reflectivity) is less than Earth's. Even though this dim light is only a reflection it can still illuminate some features of the moon. Earthshine can be best seen during the crescent phases (the 1-5 day period before or after a New Moon).
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3 years ago
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Albireo, a star in the constellation of Cygnus, is a binary system whose two components can be seen easily with even a small tel
Mandarinka [93]
The one that is blue is a hotter star
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5 0
3 years ago
The diagram shows the amount of phosphorus measured in teragrams (1 teragram = 1×10^12) grams), in the various reservoirs of the
SpyIntel [72]

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.

5 0
3 years ago
How long did the Lewis and Clark Expedition last?
kumpel [21]
The correct answer is: C: two and a half years. As a mater of fact, it started in May 1804 and lasted until September 1806. This expedition, also called Corps of Discovery Expedition was the first American expedition to cross what is now the western portion of the United States. Expedition was ordered by president Thomas Jefferson shortly after the Louisiana Purchase in 1803. The goals were to <span>explore and map the newly acquired territory, find a practical route across the Western part of the continent, and establish an American presence in this territory.</span>
8 0
3 years ago
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