Download Igneous rock

Chapter 7-Types of Rocks
Vocabulary
1. mineral
2. rock
3. igneous rock
4. sedimentary rock
5. metamorphic rock
Rocks can be made of many minerals
There are more than 4000 minerals and many
of them look alike. Scientists use physical
properties to identify mineral. Some physical
properties are hardness, luster(reflecting light),
and streak(powder left behind).
Igneous rock- forms when magma cools into
lava. Magma is melted rock deep inside the
Earth. Lava is magma that has reach the
surface of the Earth.
Basalt(ocean) and granite(continent) are
examples of igneous rock
Sedimentary Rock- sediment ( pieces of rock
that have been broken and moved) piles in
layers. These layers get pressed together, stick
together and form a rock. You may find fossils
in this type of rock.
Shale and sandstone are examples of
sedimentary rock.
Metamorphic rock- rock that has been
changed into another type of rock. Heat and
pressure usually cause this to happen. This
happens a lot when mountains are forming.
Limestone becomes marble, shale forms slate.
So marble and slate are metamorphic because
they used to be a different type of rock.