Answer:
After C14, Uranium238 is most widely used mineral in geological or archaeological dating.
Explanation:
U238 is generally used to date the rock materials, to know the age. As we know the half-life of U238, it is easy to identify the age of the materials containing uranium 238. It can be called as absolute dating method as it determines the exact age of the uranium contained material. It is a type of radiometric dating.
Explanation:
Lichen is the best species to determine the pollution of air. They are highly sensitive to pollution and will barely be found growing on trees or rock in regions where the air has been polluted.
Worms are also a good indicators of pollution in the soil. Polluted soils will have very few to no worms.
Small invertebrates like the Caddisfly are used to determine pollution of water. They are very sensitive to water pollution and cannot be found in polluted waters. In addition toads and frogs are rare in polluted waters and air.
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The main reason countries wanted colonies during this time period is for the natural resources these colonies could potentially have. They would use these resources to manufacture items In order to sell them for a huge profit. In some cases they would use these colonies for their natural harbors to trade more efficiently.
The velocity a rocket must reach to establish an orbit around Earth is called. a.thrust velocity.
