Chapter 1.pptx presentation lesson chapter 1

lessons

1. Chapter i PLATE TECTONICS

2. LESSON 1.1 PLATE BOUNDARIES

3. The Ring of Fire (also known as the Pacific Ring of Fire, the Rim of Fire, the Girdle of Fire or the Circum -Pacific belt) is a region around much of the rim of the Pacific Ocean where many volcanic eruptions and earthquakes occur.

4. Tectonic plate Tectonic plate Tectonic plate Tectonic plate Tectonic plate

5. Plate Tectonics theory Explains that Earth’s outer shell is broken up into several slabs of rock called plate, which glide gradually over the molten inner layer. A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest .

6. Geologist and scientist

7. ANTONIO SNIDER-PELLEGRINI A French geographer and scientist who theorized that the west coast of Africa and the east coast of south America has once been connected as a single continent.

8. FRANK TAYLOR Proposed that the major undersea mountain range located between South America and Africa diverged in earlier times. This mountain range is now known as the Mid-Atlantic ridge.

9. MID-ATLANTIC RIDGE The Ridge extends into the South Atlantic Ocean between the South American and African Plates. The ocean ridge rises to between 2 to 3 km above the ocean floor, and has a rift valley at its crest marking the location at which the two plates are moving apart. Ridge is a long narrow hilltop, mountain range, or watershed. Rift a crack, split, or break in something. Valley a low area of land between hills or mountains, typically with a river or stream flowing through it.

10. Alfred lothar wegener (1880-1930) A German meteorologist and geophysicist, famous for proposing the CONTINENTAL DRIFT THEORY in 1910. This theory introduced the concept of the supercontinent PANGAEA and its subsequent separation into different continents today. Drift be carried slowly by a current of air or water.

11. Wegener used biology, botany, and geology describe Pangaea and continental drift. For example, fossils of the ancient reptile mesosaurus are only found in southern Africa and South America. Mesosaurus , a freshwater reptile only one meter (3.3 feet) long, could not have swum the Atlantic Ocean.

12. The theory suggested that the crust of the earth is split up into seven large plate, all which slowly move around on the earth surface. They float on a semi-molten mantle (Asthenosphere) - the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.

13. PLATE BOUNDARY OR PLATE BOUNDARIES

14. WHAT ARE PLATE BOUNDARIES? The location where two plates meet is called a plate boundary. Plate boundaries are commonly associated with geological events such as earthquakes and the creation of topographic features such as mountains, volcanoes, mid-ocean ridges, and oceanic trenches.

15. what are these arrows represents? The pairs of arrows on the edge of each plate indicate the direction of the plates’ motion. Note that these plates boundaries either diverge, converge or slip past each other.

16. What makes the tectonic plates move?

17. Three types of plate boundaries