Refraction of light is due to the bending of light rays going through different density mediums.

true
false

Gemstones are commonly found in pegmatites, which are igneous rocks that are a. exceptionally mafic b. exceptionally coarse grained c. exceptionally fine grained d. extrusive, forming from lava

The mantle is made up of which structural zones?

What term is given to the border between the central alps and the southern limestone alps?