_______________ is the location on the surface, directly above the hypocenter (or focus) of an earthquake, where seismic waves are first felt.

Basalt is fine-grained and is primarily composed of mafic minerals. 

What leads to the formation of magma at an oceanic-oceanic convergent boundary (aka a subduction zone)?

What processes would need to occur to transform a sedimentary rock into an igneous rock?

Why are some of the most biologically productive regions in the oceans found along the western coastlines of the continents?

Which of the following Earth processes are considered external processes? Select all that apply

Numerous organisms developed ___________ during the Cambrian.

Coastal upwelling brings nutrients from the deep-ocean up to the surface. 

You analyze a bone fragment for carbon-14 and determine that 0.7 half-lives have occurred. Carbon-14 has a half-life of 5,730 years. How old is the bone fragment?

You analyze a bone fragment for carbon-14 and determine that 2.7 half-lives have occurred. Carbon-14 has a half-life of 5,730 years. How old is the bone fragment?