It became clear in the 1970's
That is true.
These are the three types:
Igneous- form when magma cools down and hardens.
Metamorphic- form under earth's surface after particles undergo intense heat and pressure.
Sedimentary- forms when different layers of sediment accumulate on top of each other and harden creating a solid piece.
Hope it helped!
Milankovitch cycle, its named for the man who theorized it
Answer:because they where still somehow related to you
Explanation:
