A valley is stricken with drought is the answer
The answer to this question is A.
Answer: The correct answer is option C, the principle of superposition.
Explanation:
In geology, the principle of superposition states that in a series of stratified sedimentary rocks, the one that sits at the bottom ( the lowest stratum) is the oldest.
According to the details given above, the geologist observed that sandstone sits on top of the granite(the granite sits at the bottom), he concluded that granite is older than the sandstones. This principle clearly demonstrates the theory of superposition.
Superposition simply means putting something on top of another (for example, placing an object on top of another object).
Therefore, the above principle describes the theory of superposition.
Abiotic and biotic are the two important elements in an ecosystem
Erosion is the process of removing rock particles by water, wind, ice or gravity.