Does anyone know this i dont know i just need help

Environmental differences within ecosystems are generally caused by

Compare the composition of the moon's surface with the composition of the earth's surface.

Prior to the mt. st. helens eruption on may 18, 1980, satellite and topographic views of the volcano were captured. based on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m? question 9 options: 600 m 400 m 750 m 500 m