The space shuttle travels in orbit, covering 2310 km in 5 minutes. How fast is that? Follow example below. Variables:
Equation:
Solve:

Variables: distance=2310 km, time=5 mins
Equation: velocity=distance/time
Solve: 2310000/300=7700
Velocity=7700 m/s

Texture and composition are different because they are not the same aspect. texture has to do with feel and so on, where as composition is the chemical makeup which you cant touch like you can texture.

Answer sample (c); // would be best because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest;