of 22 /22
1 of © Boardworks Ltd 2009 Plate Tectonic, Earthquakes, and Volcanoes What Does All This Have To Do With Biodiversity?

Plate Tectonic, Earthquakes, and Volcanoes

Embed Size (px)

DESCRIPTION

Plate Tectonic, Earthquakes, and Volcanoes. What Does All This Have To Do With Biodiversity?. Geologic Time Scale. Continental Drift. Evidence of Continental Drift. How do tectonic plates move?. What is seafloor spreading?. Plate Tectonics. What are earthquakes?. - PowerPoint PPT Presentation

Citation preview

Page 1: Plate Tectonic, Earthquakes, and Volcanoes

1 of 11 © Boardworks Ltd 2009

Plate Tectonic, Earthquakes, and Volcanoes

What Does All This Have To Do With Biodiversity?

Page 2: Plate Tectonic, Earthquakes, and Volcanoes

2 of 11 © Boardworks Ltd 2009

Geologic Time Scale

Page 3: Plate Tectonic, Earthquakes, and Volcanoes

3 of 11 © Boardworks Ltd 2009

Continental Drift

Page 4: Plate Tectonic, Earthquakes, and Volcanoes

4 of 11 © Boardworks Ltd 2009

Evidence of Continental Drift

Page 5: Plate Tectonic, Earthquakes, and Volcanoes

5 of 11 © Boardworks Ltd 2009

How do tectonic plates move?

Page 6: Plate Tectonic, Earthquakes, and Volcanoes

6 of 11 © Boardworks Ltd 2009

What is seafloor spreading?

Page 7: Plate Tectonic, Earthquakes, and Volcanoes

7 of 11 © Boardworks Ltd 2009

Plate Tectonics

Page 8: Plate Tectonic, Earthquakes, and Volcanoes

© Boardworks Ltd 20098 of 11

Page 9: Plate Tectonic, Earthquakes, and Volcanoes

9 of 11 © Boardworks Ltd 2009

What are earthquakes?

Page 10: Plate Tectonic, Earthquakes, and Volcanoes

10 of 11 © Boardworks Ltd 2009

Where do earthquakes occur?

Page 11: Plate Tectonic, Earthquakes, and Volcanoes

11 of 11 © Boardworks Ltd 2009

Seismic waves

Page 12: Plate Tectonic, Earthquakes, and Volcanoes

12 of 11 © Boardworks Ltd 2009

How are earthquakes measured?

The Richter scale can be used to measure the magnitude (power) of an earthquake’s tremor using an instrument called a seismograph. The Richter scale classifies earthquakes by magnitude from 1–10.

It is a logarithmic scale, which means that a scale 6 earthquake on the Richter scale is 10 times larger than a scale 5 and 100 times larger than a scale 4.

Do you know what the results and impacts of earthquakes of different scales are?

Page 13: Plate Tectonic, Earthquakes, and Volcanoes

13 of 11 © Boardworks Ltd 2009

The causes of earthquakes

Earthquakes occur when rocks in the Earth’s crust move suddenly. There are two main types of crust:

oceanic crust: mostly made of basalt, it is found under the oceans and continents

continental crust: mostly made of granite, it is found on the top layer of continents.

The crust is the outermost layer of the earth. Continental crust is less dense than oceanic crust and as a result it rises above it where they meet.

Page 14: Plate Tectonic, Earthquakes, and Volcanoes

14 of 11 © Boardworks Ltd 2009

Plate movements

There are four types of plate boundary:

The plates that make up the earth’s crust are moving towards or away from each other at a rate of a few millimeters a year. It is believed convection currents in the earth’s mantle cause the plates to move. The movement is not smooth, and sudden movements cause earthquakes.

convergent boundary (subduction)

convergent boundary (collision)

divergent boundary

transform boundary.

Page 15: Plate Tectonic, Earthquakes, and Volcanoes

15 of 11 © Boardworks Ltd 2009

Convergent subduction boundaries

Page 16: Plate Tectonic, Earthquakes, and Volcanoes

16 of 11 © Boardworks Ltd 2009

Convergent collision boundaries

Page 17: Plate Tectonic, Earthquakes, and Volcanoes

17 of 11 © Boardworks Ltd 2009

Divergent boundaries

Page 18: Plate Tectonic, Earthquakes, and Volcanoes

18 of 11 © Boardworks Ltd 2009

Transform boundaries

Page 19: Plate Tectonic, Earthquakes, and Volcanoes

19 of 11 © Boardworks Ltd 2009

Current Earthquakes

Page 20: Plate Tectonic, Earthquakes, and Volcanoes

20 of 11 © Boardworks Ltd 2009

Volcanoes

http://www.youtube.com/watch?v=jRfEGvp6wDU

Page 21: Plate Tectonic, Earthquakes, and Volcanoes

21 of 11 © Boardworks Ltd 2009

Ring of Fire

Page 22: Plate Tectonic, Earthquakes, and Volcanoes

22 of 11 © Boardworks Ltd 2009

Volcanoes