Which statement about erosion is true? Most erosion occurs too slowly to observe. Most erosion occurs too quickly to observe, Erosion can happen very quickly or very slowly. It is not possible to measure erosion rates.

Erosion can happen very quickly or very slowly.

e.g splash erosion occurs slowly while gulley erosion occurs very fast.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.