How can gravity's role in tectonic plate motion be described?

a. earth's magnetic field reverses

b. ridge push and slab pull

c. circulating material in the mantle

d. earth's internal heating

Environmental differences within ecosystems are generally caused by

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13

Lupe is a carrier for color blindness. her husband clifford is colorblind. if lupe and clifford have four children, what's the probability of a boy being colorblind?