How is the erosion from glaciers different than the erosion caused by rivers? a. Glaciers are driven by gravity, rivers are not
b. Glaciers from u-shaped valleys, rivers from v-shaped valleys
C. Rivers from u-shaped valleys, glaciers form v-shaped valleys
D. Rivers erode material slower than glaciers

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.