Scientists can't determine because it's far to fragile and hot to dig into the earth therefore we don't know exactly how it is just can give an estimate based on what we already know from the other layers
<span>When the water level of a stream or river exceedes its natural bank, it has reached its, </span>flood stage
Answer:
area of land dropping steeply towards deep ocean basins
MAP, they read them and help make more accurate
