Minerals cannot be formed
a. by evaporation
b. in various chemical reactions
c. during the crystallization of magma
d. when a solid substance melts to form magma

Why might the new countries be interested in joining the european union (eu)?

Which process collects sample soils from particular areas of a site? a.) repetitive sampling b.) restorative sampling c.) random sampling d.) representative sampling

Which factors add to the greenhouse effect and are caused by human activities?