A(n) is a behavior or mental act that a person repeats over and over in an effort to reduce anxiety.

Compulsion

Explanation:

Compulsion is usually defined as a type of behavior or a kind of mental act that a person does or feels like doing it continuously, over and over again, in response to a particular mania. A person does these types of mental acts in order to minimize the level of anxiety. This type of illness occurs when a person reaches such a point in terms of anxiety that it forces him/her to do such things. It affects both the physical and mental health of a person.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.