The largest extinction, measured as a percentage of species that disappeared, occurred at the end of which geological period?.

Uranium is a mineral which is used to generate electricity. predict and explain the long term effect on the environment of obtaining and using uranium as a source of energy.

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

Which country in the video has the highest population growth rate?