Below are given some sentences out of which the sentence numbered 4 has been correctly placed. The rest of the sentences A,B,C,D,E,F need to be arranged correctly in order to form a logical order.

1. Rocks are created by different processes and are of three types.
2. A rock formation is an isolated jutting out of a rock outcrop.
3. The national parks of Canada and USA in particular have many scenic rock formations.

4. Rock formations are usually the result of erosion due to weather conditions that help to shape the rock.

4. They take many different forms such as mountain peaks, gorges, canyons, buttes and mesas.
5. There are rock formations all over the world.
6. The three types of rock are sedimentary rocks, metamorphic rocks and igneous rocks.