Question

each of the following relates to divergent plate boundaries
motion of a divergent plate boundary
feature found at a continental divergent boundary
these are mountains that form underwater at oceanic convergent boundaries
at an oceanic divergent boundary, this is where the magma is coming from
best example of a continental divergent boundary
best example of an oceanic divergent boundary

Explanation:

1. At a divergent plate boundary, the plates move apart (separating).
2. A rift valley is a feature found at a continental - divergent boundary.
3. Mid - Atlantic Ocean Ridge is an example of underwater mountains formed at an oceanic divergent boundary.
4. Magma comes from the mantle at an oceanic divergent boundary.
5. The East African Rift is a well - known example of a continental divergent boundary.
6. The Mid - Atlantic Ocean Ridge is a prime example of an oceanic divergent boundary.

Answer:

motion of a divergent plate boundary: separating
feature found at a continental divergent boundary: rift valley
these are mountains that form underwater at oceanic convergent boundaries: Mid Atlantic Ocean Ridge
at an oceanic divergent boundary, this is where the magma is coming from: mantle
best example of a continental divergent boundary: East African Rift (not in the given list but a well - known example; if we must choose from the list, no perfect answer)
best example of an oceanic divergent boundary: Mid Atlantic Ocean Ridge