The living things in the biosphere are mostly made up of and .

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent

List and describe the neurological effects of the vocs and other air pollutants,as described by dr.theo colborn