The Rockstars of the Rock Cycle!
*Rock #1: Igneous

The rock cycle has no beginning and no end. Rather, it is an ongoing cycle in which rock is created and destroyed.  There are three types of rocks you will learn in this unit, igneous, sedimentary, and metamorphic.  This tackk will look at one kind of rock called igneous rock.

Some rocks were formed inside the earth.  Deep inside the earth, it is very hot.  In fact, it is so hot that rocks melt!  Melted underground rock is called magma.  Sometimes the magma erupts through the surface of the earth.  Rocks, flames, and steam spout toward the sky.  When this happens, the magma gets a new name.  It is now called lava.  As the lava piles up and hardens, it forms a volcano (click here for a video on how a volcano forms..  

Rocks from volcanoes don't always look the same.  Some look like glass.  They are smooth.  This is because they cooled really fast.  Other rocks from volcanoes cooled slowly.  Gas bubbled out, causing small holes to form.  Their surface is often rough.

Volcanoes often erupt more than once.  As soon as the lava starts to harden, more lava lands on top of it!  Rocks formed this way have bands, or streaks, in them.

Sometimes the magma stays underground and cools very slowly.  Rocks formed in this way are very hard and heavy.  You can see tiny specks of other rocks and minerals in them.

Rocks formed from magma are called igneous.  Look at your 12 rocks.  Using the clues above can you guess which of your rocks are igneous?

Assignment: Add 2 slides to your keynote
Find 2 rocks or a images of igneous rocks.  Tell how you think they cooled and how you know.

The Rockstars of the Rock Cycle!
*Rock #2: Sedimentary Rocks

Some rocks have layers.

These rocks were formed under water.  They are made up of pieces of other rocks and things like clay and mud that settled in layers under water.  After a long time, the layers piled up and stuck together.

Sometimes, plants, bones, or sea shells got caught in the layers.  They formed fossils.  Fossils are the prints of plants and animals that lived long ago.  Can you find fossils in any of your rocks?

Do you know what a pebble is?  If you look closely, you can see pebbles in some rocks that formed under water.

Because these rocks are formed of bits and pieces, or sediment, scientists call them sedimentary rocks.

Look at your rocks.  Which ones might be sedimentary?  Why?

Assignment: Add 2 slides to your keynote
Find 2 rocks or a images of sedimentary rocks. Tell how they formed

The Rockstars of the Rock Cycle!
*Rock #3: Metamorphic Rocks

Rocks don't always stay where they are formed.  Over time, floods and earthquakes move them around.  As rocks are moved, they can change.  They become twisted. They can even break up.  

Think about tearing a piece of paper.  It's easy, isn't it?  But could you tear up a telephone book?  You'd have to be pretty strong.  And do you think anyone could be strong enough to tear up a rock?  Probably not.  But this can happen as a result of underground pressure.

Heat also changes rocks.  There is heat just under the surface of the earth.  It is not hot enough to turn rocks into liquid, but it is hot enough to change them.  Think about what happens to a grilled cheese sandwich.  The cheese is solid at first, but as soon as it heats up, it becomes soft.  It changes form.  The same thing can happen to rocks.  

Find rocks 5 and 10.  Rock 10 was formed from a rock like 5.  How are they alike?  How are they different?  Rocks that have been changed this way are called metamorphic.  

Which other pairs of rocks do you think could be metamorphic?  What properties make you think so?  

Assignment: Add 2 slides to your keynote.  On one slide take a picture of rock #5 and #10.  Then comment on how they are alike and how they are different.  On the second slide find two more rocks that you think are related and write why you think so.

Put these together and you get the Rock Cycle

The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock.  Click below to see how it all fits together.

Final Assessment!

Research and review the three types of rocks using this link.

Assessment options:
#1 movie trailer - create a movie trailer in iMovie.  Your trailer must include 4 facts about each rock.
#2 online quiz / informational piece- complete the on-line quiz.  Keep taking it until you have 100%.  Take a screen shot of your results.  Then write an informational piece about the 3 rocks.
#3 poster - Create a poster showing the 3 types of rocks and where they are formed.  Include at least 3 facts about each rock.  Take a picture of your posts.

All assignments should be submitted to the "3 Rocks Assessment" assignment in Schoology.