Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
|
The Earth's Structure |
There are 4 layers to the Earth's structure, all varying in size and temperature. The crust, mantle, outer core, and inner core. |
|
|
The Crust |
The crust is the outer layer of the Earth and is made up of solid rock between 1 - 60 km thick. |
|
|
The Mantle |
The mantle is the thickest layer of the Earth being approximately 2,900 km thick. It is made up of semi-molten rock called magma. In the upper parts of the mantle the rock is solid but in the deeper parts of the mantle the rock is soft, starting to melt. |
|
|
The Outer Core |
The outer core is made up of liquid iron and nickel with temperatures above 5000°C. |
|
|
The Inner Core |
The inner core is also made up of iron and nickel but the metals are solid, not liquid. The temperatures in the inner core are around 5500°C. |
|
|
Tectonic Plates |
The Earth's crust is split up into different pieces called tectonic plates. |
|
|
Convection Currents |
Heat rises and fall in the mantle causing convection currents generated by radioactive decay in the core. The convection currents move the plates causing earthquakes and volcanoes to form. |
|
|
Plate Boundaries |
The place where two plates meet is called a plate boundary. Earthquakes and volcanoes are most likely to happen near or on plate boundaries. |
|
|
Types of Plate Boundaries |
There are 3 types of plate boundaries. 1. At a constructive or divergent plate boundary plates move away from each other. 2. At a destructive or convergent plate boundary plates move towards each other. 3. At a conservative or transform plate boundary plates slide past each other. |
