What rock type can be described as a mafic volcanic rock that is dark, heavy and appears in hand sample to be hard solid material with abundant tiny crystals of dark minerals that glint and sparkle in strong light?

a. Basalt
b. Pumice
c. Scoria
d. Rhyolite

What group has historically made up the largest portion of immigrants in mexico?

Which of the following best describes brazil's economy from 1650-1880? a. it gradually shifted to manufacturing as the industrial revolution progressed. b. it was based on mining. c. it was based on plantation agriculture, where slaves served as a labor force. d. it was based on small, family-owned farms.

Find the coordinates of a if b(-9,-10) is the midpoint of ac and c has the coordinates of (-1,9)