Answer:
the center of the earth is called the core
The basic units of length and volume are based in the metric system, good luck!
A vast, flat,treeless arctic region of Europe,Asia,&& North America in which the subsoil is permanently frozen.
Answer:
Erosion can cause water in the rivers to become heavily polluted. The water might carry pesticides, heavy metal ions and other toxic wastes. When this water will be used for irrigation purposes, the growth of plants will be heavily affected by them.
When humans use water this contaminated water from the rivers, it will led to many diseases in humans. Also, the wild- life animals which depend on this river might take in toxic compounds due to which they might die.
The answer is: convection of the core