Scientists find dense rock on earth’s surface that is made of magnesium and smaller amounts of aluminum and silicon. what layer of earth might this rock scientists study? explain your answer.

Mantle

Explanation:

The mantle is the layer that is between the core and the crust. The mantle is divided into two parts i.e. the upper mantle and the lower mantle. This mantle rocks are mostly comprised of magnesium and some amount of iron as well as silicate rocks. These rocks are highly rich in olivine and pyroxene minerals. These rocks are much denser in comparison to the crustal rocks and less denser than the rocks of the inner and the outer core. The mantle region forms a total of about 80-85% of the earth's total volume. This is the layer in which the convection current generates because of the heat radiated from the interior of the earth.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.