The Earth and its Changing Features

The Earth and Its Changing Features

1. Crust

2. Mantle

3. Core

   1. outer core

   2. inner core

Layers of the Earth

• the outermost and the thinnest layer - about 8-65 km

• made up of solid rocks and soil

• where people live

Crust

• thickest layer - about 2,800 km.

• most of the rocks are solid, others are melted.

• the temperature is very high

Mantle

• the hottest layer

• mostly made of iron

• the outer core - consists of liquid rock

• the inner core - solid rock

Core

Multiple Select

What are the layers of the earth?

Tap on all possible answers.

• crust

• land

• core

• mantle

• atmosphere

Multiple Choice

What is the hottest layer of the earth?

• crust

• mantle

• core

Multiple Choice

What is the thickest layer of the earth?

• crust

• mantle

• core

Multiple Choice

What is the thinnest and the outermost layer of the earth?

• crust

• mantle

• core

Scientists believe that a long time ago, the continents made up one big piece that eventually broke apart and spread out. They called that land mass, the Pangaea, from which the seven major lands split off.

Pangaea - The Super Continent

This theory states that the continents broke up and drifted slowly away from each other.

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Large sections of rocks or plates, about 20 in all, make up the crust or the upper mantle. Sometimes, they may hit each other or move away to create or destroy new plates.

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In 1921, scientist Alfred Wegener called the idea Continental Drift Theory.

Continental Drift Theory

Multiple Choice

What is the one big piece of land that eventually broke apart and spread out, which is also called the super continent?

• Pangaea

• Asia

• Wegener

Multiple Choice

Who is the scientist that coined the term Continental Drift Theory?

• Andrew Weber

• Alfred Wegener

• Andrew Wegener

Seafloor Spreading is a process observed where hot molten rocks or magma are moving up and coming up in between the cracks of the ocean floor.

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This pushes the present ocean floor apart leaving the cooled molten rocks to fill the gap and make a new ocean floor.

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The Altantic Ocean is getting wider through seafloor Spreading.

Multiple Choice

What is the process observed where hot molten rocks or magma are moving up and coming up in between the cracks of the ocean floor?

• Sea Floor Widening

• Sea Floor Loosening

• Sea Floor Spreading