What provides the largest source of dissolved oxygen in the ocean?

What arrow on the map points to an air mass moving toward a cold front

Which element is found in both dna and proteins

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