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Day 9
Why do some igneous rocks have large
crystals while others have small crystals or
no crystals at all?
Some form underground, where the
temperature is very warm. The magma
cools slowly, allowing large crystals to
form. Others form at the surface, where
the temperature is cooler. The lava cools
quickly, so crystals don’t have time to get
very big, and they may not form at all.
Daily Warm-Up Exercises
1
Cut-Away
2
CaSE Book Student
Resource Book, Page 25
3
A Tastier Cut-Away:
4
CaSE Book Student
Resource Book, Page 26
5
Color in Diagrams
6
CaSE Book Student
Resource Book, Page 26
7
CaSE Book Student
Resource Book, Page 27
8
Destroying & Reconstructing Earth
(Resources Book, pages 100-105)
Investigation 8
One Rock to Another
9
Convection Currents



magma near the
core heats and rises
cooler magma sinks
to take its place
results in a motion
cycle called
convection
10
Tectonic Forces
Forces
Tectonic

forces that
affect the
Earth’s crust
11
Vocabulary
Constructive Forces
mountain building
 new crust formation
 sedimentation

Destructive Forces
weathering
 erosion
 tectonic activity

12
Vocabulary
Fault
a place where Earth’s crust is broken and the
rocks on the two sides of the fault move past
one another
Monoclines
large sections of rock layers that slope down
on one side
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