How do folds form? Folds are created when sedimentary layers are compressed.
Folds are created when two plate tectonics collide.
Folds are only created during earthquakes.
Folds are only created during a volcanic eruption

Folds are created when sedimentary layers are compressed.

Explanation:

Folds can be formed when sedimentary rocks are compressed usually by compressive stress.

Folds are not necessarily created when two plate collide. Their might not be enough compressive stress to allow for the formation of a fold.

Also, folds are not created by earthquakes because it is a brittle deformation.

Fold are not created during volcanic eruption.

the core of the sun is so hot and there is so much pressure, nuclear fusion takes place, hydrogen is changed to helium. nuclear fusion creates heat and photons. when the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.