Answer:
Erosion or degradation of soils. It is the loss of it, mainly due to factors such as water and air currents, particularly in dry lands without vegetation, in addition to ice and other factors. Soil erosion reduces its fertility because it causes the loss of minerals and organic matter.
I think it's the first one and the third one. Not completely sure though.
The "spread of nuclear weapons and technology" is known as Nuclear Proliferation.
Answer: Option D
<u>Explanation:
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Nuclear proliferation is described as the spread of weapons , fissionable material, and nations that are not recognized as "Nuclear Weapon States" by the Treaty is known as the "Non-Proliferation Treaty or NPT" of Nuclear Weapons.
Proliferation is opposed by many nations due to fear of arise in nuclear warfare with nuclear weapons. This leads to de-stabilization of international or regional relations, or infringe upon the national sovereignty of states.
The amount of heat they are exposed to has a lot to do with the inferences and observations that they make on the density of the earth's core. The inner core is the most compact due to the fact that they have a lot of direct exposure to heat and the gravity of the earth pressung down on it. The inner core is less subjected to those conditions.
