Day 9

1
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 dont have time to get very
big, and they may not form at all.
Daily Warm-Up Exercises
2
Cut-Away
2
3
CaSE Book Student Resource Book, Page 25
3
4
A Tastier Cut-Away
4
5
CaSE Book Student Resource Book, Page 26
5
6
Color in Diagrams
6
7
CaSE Book Student Resource Book, Page 26
7
8
CaSE Book Student Resource Book, Page 27
8
9
Destroying Reconstructing Earth(Resources
Book, pages 100-105)

• Investigation 8
• One Rock to Another

10
Convection Currents

• magma near the core heats and rises
• cooler magma sinks to take its place
• results in a motion cycle called convection

11
Tectonic Forces
Tectonic Forces

• forces that affect the Earths crust

12
Vocabulary
Vocabulary

• Constructive Forces
• mountain building
• new crust formation
• sedimentation
• Destructive Forces
• weathering
• erosion
• tectonic activity

13
Vocabulary
Vocabulary

• Fault
• a place where Earths 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