When the earth was large enough, it is believed to
have separated into layers with the densest layer in
the center (the core), the next dense layer in the
middle (the mantle), and the least dense layer at
the surface (the crust). What force caused earth's
elements and compounds to separate into layers?
A gravity
B impacts from planetesimals
c heat from the decay of
radioactive elements
D all of the above
The Palenie

D

Explanation:

The stratification of Earth into its geologic layers was brought about by the formation of the Earth's iron core. The iron core was generated by a combination of radioactive decay and gravitation, which raised the temperature enough for molten iron to form.

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.