Oh Boy
The particular chemical makeup and arrangement of the atoms in the crystal is unique to each...
Mineral
If you see large, perfectly formed crystals, it means the mineral had...
Time to grow.
Form when melted rock material from inside Earth cools...
Igneous Rocks.
If the silica content is far less, but it contains more iron, magnesium, or calcium, a dark-colored or...
Granitic.
Sediment can collect in layers to form rocks. These are called...
Sedimentary Rocks.
Rocks usually are made up of at least how many minerals?
Two or more.
Minerals that are rare and can be cut and polished, giving them a beautiful appearance...
Gems.
When melted rock material cools on Earth’s surface, it makes an...
Extrusive Igneous Rock.
Extrusive igneous rocks often are...
Basaltic.
When sediment is dropped, or deposited, by wind, ice, gravity, or water, it collects in...
Layers.
One way is from melted rock material inside Earth called...
Magma
A gem also must have a beautiful...
Luster and Color.
When the melt cools below Earth’s surface it forms...
Intrusive Igneous Rocks.
Extrusive igneous rocks form when...
Melted rock material cools on the earth surface.
After sediment is deposited, it begins the long process of becoming a...
Rock
As magma cools, atoms combine in orderly patterns to form...
Minerals.
One reason why gems are so rare is that they are formed under...
Special conditions.
Light-colored igneous rocks are called...
Granitic Rocks.
When the melt reaches Earth’s surface, it is called...
A fossil is the remains or trace of a once-living...
Plant or Animal.
Large mineral grains that fit together like a puzzle seem to show up in rocks formed from slow-cooling...
Magma.
Scientists suggest that diamond forms deep in Earth’s...
Mantle
If the silica content is far less, but it contains more iron, magnesium, or calcium, a dark-colored or
Basaltic rock will result.
Pieces of broken rock, shells, mineral grains, and other materials make up what is called...
Sediment.
New rocks that form when existing rocks are heated or squeezed but are not melted are called...
Metamorphic Rocks