Answer:
Paleozoic
Explanation:
The Paleozoic Era is a geologic era that lasted from 541 to 251.902 million years ago. This is divided into six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. The swamps that were turned into coal over time grew during the Carboniferous period, which expands from 358.9 million years ago to 298.9 million years ago. The period is well-known because many coal beds were formed during that time period. During the Carboniferous, terrestrial animals were well-established. It ended with a minor extinction event known as the Carboniferous rainforest collapse.
Explanation:
The mean angle is all the angles added up together then divided by how many angles they were. For example:
I have four angles 44°, 37°, 29° and 67°, what I would do is add them all up together, i.e, 44+37+29+67, which equals to 180. Then I would divide 180 by how many angles they were, so I would do 180÷4 which equals to 45. So the mean angle would be 45°, that's how you find the mean, hope that helps.
Groundwater is important for us as it is the greatest source for freshwater, crop irrigation and agricultural activities.
In general, groundwater is present in reservoirs and aquifers below the surface of the earth and also most crucial natural source of water for any nation. Groundwater provides fresh drinking water to almost 50% of global population. With an ever increase in global population, the use of groundwater is also increasing.
The primary way of wasting fresh water is its overuse in households such as in kitchen, toilets for taking long showers, washing and bathing purposes.
We can save groundwater by avoiding unnecessary leakage, unnecessary showers, and decreasing shower time.
If you need to learn more about groundwater click here:
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Answer:
Lava erupts from Earth and cools.
Explanation:
