water
People think it is a major concern mainly because it "IS" a major concern for those of us who would like to keep breathing the oxygen in earths atmosphere, and for those who would like their grand children to have free oxygen available via the earths biosphere.
Plants. However, the main source of energy for the planet and mainly for the biosphere comes from the plankton in the oceans.
The Earths Core, consists mainly of Iron and Nickel.
No, we don't have a limited amount of eyelashes and their growing rate depends on age as with all hair in our body which mainly has to do with blood flow. As we age, blood doesn't circulate as fast as when we are young thus less oxygen and nutrients decreased amount and growth of hair.
Molecular Oxygen is mainly found in atmosphere.Element oxygen is abundant in biosphere and lithosphere too
Molecular Oxygen is mainly found in atmosphere.Element oxygen is abundant in biosphere and lithosphere too
There are almost no extrusive rocks on the earths surface because they are all under the earths surface. They are mainly lower than the earths surface.
Mainly iron and nickel.
there are various answers to this question based on opinion, but our role is mainly to be the care taker of the world around us. Hence, we are supposed to take care of the biosphere with the gift of intelligence
Erosion, weathering
crust
Because of gravity.