Embark on a captivating journey with The Earth’s Layers Foldable Answer Key, a comprehensive guide that unlocks the mysteries of our planet’s structure and composition. Delve into the depths of the Earth, exploring the intricate layers that define its unique characteristics and processes.
From the solid crust to the molten core, this guide provides an in-depth analysis of each layer, revealing their properties, composition, and significance. Discover the forces that shape the Earth’s surface, the resources it holds, and the vital role it plays in sustaining life.
Earth’s Layers
The Earth is a complex planet with a layered structure, consisting of the crust, mantle, and core. Each layer has distinct characteristics and compositions that contribute to the Earth’s overall structure and dynamics.
The Earth’s Crust, The earth’s layers foldable answer key
The Earth’s crust is the outermost layer, ranging in thickness from 5-70 kilometers. It is composed primarily of solid rock and is divided into two main types: continental crust and oceanic crust. Continental crust is thicker and less dense than oceanic crust, and it is found under the continents.
Oceanic crust is thinner and denser than continental crust, and it is found under the oceans.
The Earth’s Mantle
Beneath the crust lies the mantle, which extends to a depth of about 2,900 kilometers. The mantle is composed of solid rock that is denser than the crust. It is made up of silicate minerals, such as olivine and pyroxene, and is heated by the Earth’s core.
The mantle is responsible for generating magma, which rises to the surface to form volcanoes.
The Earth’s Core
The Earth’s core is the innermost layer, extending from the mantle to the center of the Earth. The core is composed of iron and nickel and is extremely hot, reaching temperatures of up to 5,700 degrees Celsius. The core is responsible for generating the Earth’s magnetic field, which protects the planet from harmful radiation.
Earth’s Structure
| Layer | Thickness (km) | Density (g/cm3) | Temperature (°C) |
|---|---|---|---|
| Crust | 5-70 | 2.7-3.0 | 10-100 |
| Mantle | 2,900 | 3.3-5.7 | 1,000-3,700 |
| Core | 3,485 | 9.9-13.0 | 5,700 |
Major Tectonic Plates
- North American Plate
- South American Plate
- Eurasian Plate
- African Plate
- Antarctic Plate
- Australian Plate
- Pacific Plate
Internal Structure Diagram
[Diagram berlabel yang menunjukkan struktur internal Bumi]
Earth’s Processes
Plate Tectonics
Plate tectonics is the movement of the Earth’s tectonic plates. These plates move slowly over the Earth’s surface, driven by convection currents in the mantle. Plate tectonics is responsible for the formation of mountains, volcanoes, and earthquakes.
Convection Currents
Convection currents are currents of hot, molten rock that rise from the Earth’s core and move through the mantle. These currents transfer heat from the Earth’s core to the surface.
Earthquakes and Volcanic Eruptions
Earthquakes are caused by the sudden release of energy when rocks break along a fault. Volcanic eruptions are caused by the release of pressure from magma that rises from the Earth’s mantle.
Earth’s Resources
Mineral Resources
- Crust: Coal, oil, natural gas, minerals
- Mantle: Diamonds, kimberlite
- Core: Iron, nickel
Magnetic Field
The Earth’s core generates the Earth’s magnetic field, which protects the planet from harmful radiation.
Atmosphere
The Earth’s atmosphere supports life on the planet by providing oxygen and protecting it from harmful radiation.
Essential Questionnaire: The Earth’s Layers Foldable Answer Key
What are the major layers of the Earth?
The major layers of the Earth are the crust, mantle, and core.
What is the thickest layer of the Earth?
The mantle is the thickest layer of the Earth, with a thickness of approximately 2,900 kilometers.
What is the hottest layer of the Earth?
The core is the hottest layer of the Earth, with temperatures reaching up to 5,700 degrees Celsius.
