getitgurl:

Astronomy and Geology are not the same thing. Stop talking about fucking rocks.

Kthnxbye. Love, Ashley

Actually they’re incredibly intertwined, sharing many key foundations. You can’t seriously expect to be able to have a full understanding of geology without knowledge of astronomy, and vice versa. If you want to know how the Earth formed, you have to study rocks from the asteroid belt as well as those from Earth and the other planets. If you want to know why they are the way they are, you have to study the makeup of the sun, other stars, and gas nebulas in the universe. Just saying “oh, look at all the pretty aluminium in that nebula over there” is meaningless unless you have a solid grasp of what the chemical elements do when they condense into something like a planet. Or a rock.

Sincerely, a geologist who studies rocks from places that aren’t the Earth.

freshphotons:

via USGS

Six Things to Know About the Earth’s Mantle: The basics you’ll need to know if you’re going to talk about anything to do with the mantle.