Earth’s Layers
Layer that we live on
crust
When you look at a world map, you might notice that continents look like one of these.
a jigsaw puzzle
Plates move apart in this type of plate boundary
divergent
Eruption event that occurred on May 18th, 1980
Mount St. Helens
Release of energy from plate movement causes shaking: potential for harm, damage
Earthquake
Solid sphere of mostly iron
Inner Core
The theory that suggests continents move slowly over time
Continental Drift Theory
Plate move past each other at this type of plate boundary
Transform
Volcano with gently sloping sides
Shield
Waves created by earthquakes
Seismic
Semi Liquid layer heated by outer core. Has convection currents
Mantle
Mid ocean ridges and trenches are what type of evidence
Seafloor structures
Plates move towards each other at this plate boundary
Convergent
Forms when at a convergent subduction zone
Volcano
The first type of wave observed at a location after an earthquake
P Wave
Zone within the middle mantle, tectonic plates move on top of this
Asthenosphere
This type of evidence is found on many continents, but there is a lot in Africa
Fossil Evidence
Two natural disasters that plate movement can cause
Volcanoes & Earthquakes
Formed from alternating layers of ash then lave
Composite Volcano
Type of wave, Slithers, Creates major damage
S Wave
Layer made of Crust + Upper Mantle
Lithosphere
Scientist who first theorized continental drift theory
Alfred Wegener
A type of convergent plate boundary: oceanic to continental crust
Subduction
Small, Formed from volcanic debris
Cinder Cone
Where an earthquake originates
Epicenter