The surface of the earth is not level although weathering and erosion have been occurring for millions of years which is the best explanation of this observation

A. The sea level keeps changing.
B. Movements in the earth's surface continue to occur.
C. There has not been enough time.
D. Wind and water erosion are not strong enough.
E. Glacier movement is required to smooth the earth's surface.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force