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

hello from mrbilldoesmath!

answer:

104 f = 40 c

discussion:

9/5c + 32 = f               => in our case, f = 104

9/5c + 32 = 104           => subtract 32 from both sides

9/5c         = 104 - 32   =>

9/5c   = 72                   => multiply both sides by 5/9 (the reciprocal of 9/5)

(5/9)*(9/5) c = 72 * (5/9) =>

c = 72*5/9 = 360/9 = 40

you,

mrb