The goal of this game is to enter all your answers as fast as possible. Your score is based on
the flashcard that takes the longest. You are only as fast as your slowest answer, so you need to know
all your flashcards to do well.
The answer is:
triangle
Enter the answer above to continue.
Any crystalline rock having a foliated structure and hence admitting of ready division into slabs or slates.
(geology) Relating to the eons before the Phanerozoic
A rock consisting of small crystals of olivine, pyroxene and hornblende; the major constituent of the Earth's mantle.
A coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica. Often contains other minerals, which may be of economic importance. Common colors are gray, white, and pink.
A conical deposit of rock fragments around a volcano.
Having been structurally altered as a result of, or resulting from, exposure to intense heat and/or pressure (at the contact zone between colliding plates, for example).
The rigid, mechanically strong, outer layer of the Earth; divided into twelve major plates
any organic matter present in a sedimentary rock that is insoluble in organic solvents; the precursor of oil and natural gas
Of a geologic era within the Phanerozoic eon and comprises the Triassic, Jurassic and Cretaceous periods from about 230 to 65 million years ago when life on earth was dominated by reptiles.
A tall conical volcano, composed of layers (or strata) of hardened lava, tephra and ash.