Plate Tectonics “Building Up and Tearing Down”
Brittle vs. Ductile • Brittle: Breaks relatively easily. • Ex: A wooden pencil • Ex: Peanut Brittle (Yum) • Ductile: Relatively flexible. • Ex: A denim pencil • Ex: Silly Putty
Continental vs. Oceanic Plates • Less Dense • Thicker (35-70 km) • Brittle (Not Stretchy) • Much Older (3.7 billion years old) • More Dense • Thinner (5-10 km) • Ductile (A Bit Stretchy) • Much Younger (144 million years old)
Plate Movement Observations Wrinkled Edges Both Go Up Black Goes Down
Divergent Plate Boundaries Divergent Plate Boundaries are where the plates are moving (Drifting) apart.
Iceland Rift Valley
Convergent Plate Boundaries Convergent Plate Boundaries are where the plates are colliding (coming together).
Folded Mountains Himalayan Mountains
Island Arcs Aleutian Islands (AK)
Transform (Fault) Plate Boundaries Transform (Fault) Plate Boundaries are where the plates are sliding past each other. (Like two trains going past each other, I know it’s a stretch).
Plate Movement Model Lab Big Idea (Inquiry 15.1) Plate tectonics lead to formation of land and landforms as well as the destruction of crust. It is important to know which landforms are created at which types of plate boundaries. There are some interactive websites that are helpful with this topic.