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Igneous Rock Lab Answer Key

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by

Mike Rogers

on 12 April 2018

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Transcript of Igneous Rock Lab Answer Key

1. These are microscopic pictures
of two different rocks.
Which one had more time to cool & grow crystals?
Crystals will grow
BIGGER
when they have
MORE TIME
to cool.
2. Which of these two rocks cooled
faster? Which one cooled slower?
Why do you think that?
3. Which of these rocks must have cooled near or on the surface? Which one must have cooled deep below the surface? What did you observe that makes you think that?
4. How could this rock have formed both large and small crystals at the same time?
5. Why does this rock have holes in it? What guesses can you make about its formation?
6. Did this rock come pouring out of a volcano as lava? Describe some observations you made to back up your opinion.
BIGGER CRYSTALS means SLOWER COOLING.

SMALLER CRYSTALS means FASTER COOLING.
Magma cools
SLOWER

underground
,
and
FASTER

on the surface
.
The rock started off by
cooling slowly

deep underground
,
making
large crystals
.
Later the rock began
cooling much faster
on the surface
finishing off with
small crystals
.
The holes are leftover air bubbles.
The rock froze solid before the bubbles could pop and the lava come back together.
The crystals are HUGE!
No way
it cooled fast
on the surface!
This rock probably began
cooling deep below
the surface.
But then moved closer to
the surface before it finished cooling.
7 How can the size of crystals inside an igneous rock tell you how fast that rock cooled, or how deep underground it formed?
8 Why are some rocks darker or lighter than others?
9 Why can't you seem to find any fossils in these kind of rocks?
10 What are some characteristcs you would use to group igneous rocks together? How many categories can you make?
Rocks that cool
underground

cool

slower
and have
larger crystals
.
Rocks that cool on the
surface cool fast
, and have
small crystals
.
Because they're made from different minerals. Duh! :D
Hmmmm... What happens to bones and shells that are left in magma at 1000C?
THEY MELT!!!!
Color?
Crystal Size?
10-7
Expert
6-4
Intermediate
3-0
Novice
So Now!
Think you can guess
the "Laws" of Igneous Rocks?
Full transcript