The answer is C. Mikhail Gorbachev helped the Soviet Union improve relationships with the US.
Oxygen and silicon form the basis for silicates, the most common and abundant rock-forming minerals".
<h3>What are minerals?</h3>
Minerals are referred to as substances that occur naturally and remain inorganic in nature.This is a compound with a recognizable chemical composition, crystal structure, and physical characteristics.
The formation of silicates is done with the help of melted rocks cooling and crystallizing. Silicon dioxide is a chemical substance known as silica. It develops when silicon is in contact with oxygen.
This includes Minerals like quartz, feldspar, olivine, and a wide range of clay minerals are among them.
Learn more about rocks, here:
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<u>Answer:</u>
The seismic waves that stay on the Earth's surface are called surface waves.
<u>Explanation:</u>
- The waves that are formed near the Earth's surface and are sandwiched between the surface of the Earth and the atmosphere are known as surface waves.
- These waves are not absorbed back by the surface or do not even mix up with the atmosphere easily.
- Thus they stay on the surface of the Earth for a long time after they are generated.
C crater
B central vent
G laccolith
F magma chamber
E sill
A batholith