Explanation

Acoustics is a branch of physics that deals with the study of sound and its behavior. 

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Nuclear energy is generally considered the strongest type of energy due to its high energy density and release rate.

Nuclear reactions release a vast amount of energy per unit of mass.

This making it a highly concentrated and powerful source of energy.

Explanation

The approximate height of Earth's atmosphere is 6,200 miles (10,000 kilometers).

This is the approximate extent of the exosphere, the outermost layer of the atmosphere, which gradually merges with space. 

Explanation

Diamond is an excellent conductor of heat due to strong covalent bonding and crystal structure.

It is a strong electrical insulator because it lacks free electrons to carry current.

Explanation

The thickness of Earth is about 13,700 kilometers (8,500 miles).

The mantle, which is the biggest part of Earth by volume, is approximately 2,900 kilometers (1,800 miles) thick. 

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Photographic films contain silver halide crystals that are sensitive to light.

These crystals react to light exposure and form the image when developed.

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The cushion increases the time it takes for the body to stop, which reduces the force of impact.

This reduces the likelihood of injury, as force is spread over a longer period.