Post on 14-Jun-2015
Ch. 9Lesson 2
What causes earthquakes &
volcanoes?
plate
• section of lithosphere
• move b/c of gravity & convection currents
Plates at our planet’s surface move because of the intense heat in the Earth’s core that causes molten rock in the mantle to move. It moves in a pattern called a convection current that forms when warm material rises, cools, and eventually sinks down.As the cooled material sinks down, it is warmed and rises again.
3 kinds of plate
boundaries
converging boundary
spreading(divergent)boundary
sliding (transform)boundary
2 platescollide
plates moveapart
•plates move past each other
•oppositedirections
Plate Boundaries interactive animation
converging plate boundary
Converging plate boundary animation
spreading plate boundary
Atlantic Ocean-
spreading plate
boundary
sliding plate boundary
California-sliding plate boundary
Which plate boundary type caused this? converging, spreading or sliding
converging plate
boundary
Which plate boundary type caused this? converging, spreading or sliding
sliding plate
boundary
Which plate boundary type caused this? converging, spreading or sliding
converging plate
boundary
Which plate boundary type caused this? converging, spreading or sliding
spreading plate
boundary
Plate boundaries edible activity
Bill Nye Song-Earthquake Rumble
earthquakes•destructive force•occur @ faults along plate boundaries
•energy released can cause landslides & tsunamis
fault• crack in Earth’s crust where surrounding rock has moved or shifted
place on Earth’s surface above focus
place where plates start to slip
Earthquakes [00:57]
landslidelandslide
large wave caused by earthquake under the ocean
Tsunami Clay Animation
• Although you might not wish to touch lava with a "ten foot pole“, this potentially hazardous activity is all in a day's work for a volcanologist.
• The long pole contains a
special probe that can measure the temperature of the lava.
volcanoes• form near colliding plate boundaries
• constructive process-makes new land
volcanoes• form volcanic islands when reaches surface of water in ocean