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rocks and their properties

To find this puzzle created by Rowan Loesch, visit:
CrosswordHobbyist.com/194921

Across
a rock that is formed from the sedimentary rock limestone.
A rock that is formed from the igneous rock basalt.
a common rock that contains at least 25% quartz and is sometimes used in construction because of its strength.
a metamorphic rock that is formed from the sedimentary rock limestone
a volcanic glass that forms quickly without crystal growth,
naturally occurring solids made up of minerals.
an unusual, lightweight rock formed when molten rock is rapidly blown out of a volcano
sandstone, mudstone, flint, greywacke and chalk.
a metamorphic rock that is formed from the igneous rock basalt.
a soft, white form of limestone.
forms the metamorphic rock quartzite.
Down
orms the metamorphic rock slate
tamorphic rock that is formed from the sedimentary rock sandstone.
anthracite, quartzite, marble, slate, granulite, gneiss and schist.
a rock formed from volcanic ash
a metamorphic rock that is formed from the sedimentary rock mudstone.
When magma cools and solidifies it forms this rock
a hard, sedimentary form of the mineral quartz.
the metamorphic rock granulite when subjected to extreme heat and pressure over time it forms this rock
What The Earth's crust is made up of
a type of coal with a high carbon count, few impurities and with a high luster
The atoms and molecules of melted minerals are what make up this thing