1. HOW TO CLASSIFY
ROCKS
By Collette Phillips

3. Sedimentary rocks

4. Which one is a sedimentary rock?
Look for rounded grains and how
the rock layers are aligned.

5. Which one is clastic?
Which one is non-clastic?
.Hint: Clastic rocks are formed more by abrasion. Non-
clastic rocks are made from chemicals

6. Metamorphic rocks

7. Which one is a metamorphic rock?
Look for strong banding &
orientation.

8. Which one is foliated?
Which one is non-foliated?
Hint: Foliated metamorphic rocks are banded together
more. They get this way by different amounts of heat and
pressure.

9. Igneous rocks

10. Which one is an igneous rock?
Look for texture and small
crystals.

11. Which one is intrusive?
Which one is extrusive?
Hint: Intrusive igneous rocks have larger minerals or
crystals than extrusive igneous rocks

13. Now the Quiz
Q: What makes a sedimentary rock clastic?
What makes it non clastic?
A: Clastic rocks are shaped by
abrasion. Non-clastic rocks are made with
chemicals.
Q: What how can you tell the difference from a
foliated metamorphic rock and a non-foliated
rock? A: A foliated rock is banded
together, while a non-foliated rock’s minerals it
more spread out.
Q: How can you tell a intrusive rock from an
extrusive rock?
A: Intrusive igneous rocks have
bigger minerals, because they were made inside
the Earth. Extrusive rocks are have smaller
minerals because they cooled fast outside the
Earth’s crust.

14. • http://www.youtube.com/watch?v=It5rl4dUXMk