Oceanic crust is primarily composed of ____________, a heavy dark ...

[fnuegbu]

Oceanic crust is primarily composed of ____________, a heavy dark colored rock composed mostly of oxygen,
  silicon, magnesium, and iron. Fill in the blank(s) with the appropriate word(s).

Question 2

S waves are also called ____________ waves. Fill in the blank(s) with the appropriate word(s).

[steff9894]

Answer to Question 1

basalt

Answer to Question 2

secondary, shear

[fnuegbu]

Excellent

[Dinolord]

Gracias!