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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 13