Earth science help plz?

[Jimmy C]

need some help with some questions and i would really apreciate it if u can help me, thanks.

Does anyone know the definiton of exothermic reaction and endothermic reaction, I've looked through the physical science book and can't find anything.

Which is more resistant to the physical wear of foot traffic and why? Granite or Marble?

Solid angular fragments were hurled to the center of the crater. How could it form into a sedimentary rock and which one is it?

You observe that a sample of mineral has many smooth size or surfaces. The sample has not beem cut, sanded or otherwise smoothed by people. Describe two ways in which the parallel smooth sides of the mineral specimen were most likely formed. Then describe an experiment that could help you determine which of the two ways formed the smooth sides on this mineral specimen.

Describe two conditions that can result in the metamorphis of a rock.

Thanks, these are the questions I don't get.

Also, I need them very soon