Help please?
Need it ASAP :((

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved

How many moles are in 7.2 x 10^23 carbon molecules?