Explanation:

- The question talks about a landform that’s a deep valley with steep, nearly straight sides, and about the same width at the top and the bottom.

- Let’s break down the options:

- Gorge (): This fits perfectly. Gorges are deep, narrow valleys with steep, almost vertical sides. They’re usually about as wide at the top as they are at the bottom.

- Relief: This is a general term for the shape of the land—not a specific feature.

- Canyon: Canyons are also deep valleys, but they usually have wider tops than bottoms. Think Grand Canyon—much wider at the top.

- Strait: This has nothing to do with valleys. It’s a narrow passage of water between two landmasses.

- So, the best match is Option 1: Gorge.