The three types of tectonic plate boundaries are:
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Transform boundary: This is when two plates slide past each other.
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Divergent boundary: This occurs when two plates pull away from each other.
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Convergent boundary: This is when two plates collide with each other.
So, your completed sentences would be:
- When two plates slide past each other, they form a Transform boundary.
- A Divergent boundary occurs when two plates pull away from each other.
- When two plates collide with each other, they form a Convergent boundary.