Rocks
By: Hannah, Harrison, Jacob
TEK 6.10B; Classifing Rocks
A student is expected to classify rocks
as a Metamorphic, Igneous, or
sedimentary by the process of their
formation.
How rocks are classified?
Rocks are classified by their
streak, luster, harsness, color,
and density.
Igneous rock
Formed from the mantle, when cooled then forms Igneous rock.
Metamorphic
Formed from layers of the earth compacting and cousing heat and pressure.
Sedimentary
Rocks formed when particles of rocks and other materials are pressed together.
Can one type of rock change into another kind of rock?
Yes, the rock cycle shows that there
are many different ways that rocks
can become other types of rocks.
Classifying Sedemintary rocks
When a student is making a model of
the primary way that sediment and
organic material form from sedimentary
rocks, they should include the process
of cementation.
Classifying Igneous rocks
Scientists can tell when Igneous rocks
form slowly because igneous rocks with
a coarse crystal size will be cooled slower
than rocks with a fine grain size.
Classifying Metamorphic rocks
metamorphic rocks are classified on the
basis of texture (grain size, shape,
orientation) and mineral composition.
How does a metamorphic rock turn into an ignious rock?
Metamorphic rocks turn into igneous
rocks when a metamorphic rock melts
into magma and then cools into a
igneous rock.