Global Tectonics Study Guide
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Since new ocean floor is constantly being made at a Divergent Plate Boundary, what happens to the old ocean floor so that the Earth doesn't grow in size? Plate Tectonics Study Guide KEY. Use this KEY to check your answers on your study guide. Answers do not need to be word- for-word the same, but details and. Mar 21, 2013 - Background Info; Questions; Fast Facts; Explore More; Vocabulary. The theory of plate tectonics states that the Earth's solid outer crust, the.
Take a minute and think of your favorite puzzle. Better yet xE2 x80多ave you ever built a 3-D puzzle? I want you to imagine a 3-D puzzle of the Earth made up of different sized pieces. Do you have that imaginary puzzle in your mind?
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You have just visualized your first concept of plate tectonics! Layers of the Earth Before understanding the entire theory of plate tectonics, we need to take a look at the different layers of the Earth.
The Earth is made of of three generic layers: the outside is called the crust, below the crust is the mantle, followed by the innermost core. An Illustrated Inside Look at the Layers of the Earth The crust is just how it sounds: a rigid, cool layer, very much like the crust of your favorite pie! Just like the pie may have a nice, warm, gooey inside, the Earth's crust floats on top of a layer similar to that of the pie. This layer is made up of hot, partially melted rock and is called the mantle. The melted rock in the mantle is constantly moving underneath the crust because of uneven heating, or convection currents. The core is the innermost layer that's extremely hot and is the energy source for the uneven heating of the mantle's convection movement.
Biology fossil record study guide answer key. Miller Levine Table of Contents go to page page Chapter 1 The Science Of Biology 1.1 What Is Science?
A Diagram Illustrating the Idea of Mantle Convection Currents Let's get back to visualizing the outer layer of the crust. This is a solid, rigid layer that is broken up into puzzle pieces that float on an unstable molten layer of the mantle. The idea that these different 'puzzle pieces,' called tectonic plates, are constantly moving and changing the surface of our Earth is a simplified version of the theory of plate tectonics. 15 Main Tectonic Plates and their General Direction of Movement The Plate Tectonics Theory The theory of plate tectonics is one of the most important theories in the history of Earth science because it gives reasoning to what causes earthquakes, volcanoes, and the ever-changing surface of our planet! Innovative technology in the 1950s allowed scientists to use sonar (sound waves) to capture an image of the bottom of the ocean.
Before this technology, most people assumed that the bottom of the ocean was completely flat and smooth, much like the bottom of a swimming pool. Once scientists were able to see what it really was like, there were astonished! They saw mountains, valleys, ridges, trenches, and volcanoes, all underneath the water!
6th Grade Plate Tectonics Study Guide
Modern Day Sonar Image of Underwater Landslides from an Earthquake. Geologists now had evidence to support their theory of tectonic plates. Since the plates, or 'puzzle pieces,' of our crust are floating on top of circulating magma mantle, there is constant movement, change, destruction, and creation of our landscape and ocean floors. This theory of constant change of these plates is the main idea behind the theory of plate tectonics. This change happens very slowly, but thousands, millions, and even billions of years of movement have led to what we see on our maps today. The plate tectonics theory gives reasoning to the Atlantic Ocean floor getting larger, and the Pacific Ocean getting smaller - concepts that will be explained more in depth in another lesson. Plate tectonics give reason to the formation of violent volcanoes, beautiful islands, magnificent mountains, extraordinary valleys, and devastating earthquakes.
Lesson Summary To sum up, the Earth's crust is broken up into pieces called tectonic plates, and these plates float on top of a constantly moving, semi-liquid layer called the mantle. The convection currents in the mantle are caused from the uneven heating from the core. The plate tectonics theory gives reason to all the landforms and constant change we see on the surface, as well as underwater, which we can see today, thanks to sonar technology. Mountains, volcanoes, trenches, and many more landforms exist because of plate tectonics.
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