What is formed at divergent plate boundaries?
Valleys and oceanic ridges are formed at divergent plate boundaries.
When two plates move away from one another, the space left behind is filled with magma and other material from inside the earth.
If this happens in the ocean, an oceanic ridge forms or a volcanic island. If two plates diverge within a continent, then a rift will form and this rift will eventually become a valley.
Examples of landforms created from divergent plates include the Mid-Atlantic Ridge (in the ocean) and the Great Rift Valley, which is can be seen in the image below.