True.
In the upper layers of the atmosphere, it blocks UV radiation from the sun; however, in the lower layers, it is a pollutant.
The biodiversity would change over time through ecological succession. This can be done many ways. One way would be through a damaging event, such as a forest fire or flood. Then, a pioneer species would start growing. A pioneer species would then lead to increased biodiversity in both antibiotic and biotic factors, therefore strengthening the ecosystem even more.
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They do lower the activation energy but they provide an alternate pathway for the reaction to happen quicker and they do not get used up in the reaction
Answer: B. The color of a mineral's powder doesn't change.
C. The densities of many minerals are quite similar.
D. A mineral can break in only one way.
A mineral is a naturally occurring inorganic compound. It is a chemical compound that usually found in crystalline form. The color of the mineral's powder can change because of the oxidation or reduction of particles present in it. The density of many minerals cannot be same because all mineral particles exhibit different composition of atoms or molecules which are responsible for physical and chemical structure of minerals. Hence, minerals vary in density. A mineral can be broken down into many ways like fracture, cleavage and other methods.
