Earth Structure and Plate Tectonics - Earth's Inner Structure Was Gradually Revealed - Each of Earth's Inner Layers Has Unique Characteristics

4 important questions on Earth Structure and Plate Tectonics - Earth's Inner Structure Was Gradually Revealed - Each of Earth's Inner Layers Has Unique Characteristics

What is the ocean crust made of?

It is primarily basalt, a heavy dark colored rock composed mostly of oxygen, silicon, magnesium and iron. The crust is rather thin and differs in thickness, composition and age.

What does the continental crust consist of?

The most common material in this crust is granite: a familiar speckled rock composed mainly of oxygen, silicon and aluminium.

What does the mantle consist of?

The layer beneath the crust is thought to consist mainly of oxygen, iron, magnesium and silicon. Most of the Earth is mantle.
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How is the behaviour of a rock detemined?

It is determined by 3 factors: temperature, pressure and the rate at which deforming force (stress) is applied.

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