Earth’s magnetism is related to the circulation of molten material within earth’s core.

True

Explanation:

The core of the earth consists of molten iron enriched with nickel. This molten iron is mainly responsible for the generation of earths magnetic field. The motion of convection currents creates a geodynamo that produces alternating magnetic field .

The molten core rotates because of rotation of earth on its axis due to which the magnetic poles reverses geographically.

Hence, the given statement is true.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs