1. Tectonic Plate:
Pieces of the lithosphere that move around on top of the asthenosphere are called tectonic plates.
Tectonic plates consist of the crust and the rigid, outermost part of the mantle.

2. Chapter 4 Section 1 Pages 100-102
Tectonic Plates

3. All have names (Big major and Small minor)
Tectonic Plates –
Pieces of the lithosphere (Crust + Upper Mantle) that move around on top of the asthenosphere.
All have names (Big major and Small minor)
Not all plates are the same.
Some - Oceanic crust only
Some - Continental crust only
Some - Both

4. Tectonic Plates are made up of lithosphere, which is the crust plus the upper mantle.
Plates float, touch, and move around
Plates cover the layer below, the asthenosphere.

5. How do we know? Geologists measure earthquake waves
Seismic Waves travel at different speeds.
The speed depends on the density and composition of the material.
Waves travel faster through a solid than a liquid.