Steep cliffs also develop in sedimentary which are both strong and resistant to weathering. same is true of , but only in arid climates. in contrast, generally form broad, gentle slopes because they are much weaker and erode quite easily.

Missing answers respectively are, sandstone, limestone and shale.

Explanation:

Sandstone has medium sized grains thus are not easily weathered.

Limestone is formed due to the calcium in dead plants and animals over time thus solidifies into a rock, limestone breaks down easily when put in continuous contact with water or liquid substances but is quite tough in dry or arid conditions.

But shale on the other hand is a very fine grained rock and is easily weathered away due its mud like and clay like clastes forming very gentle terrains unlike the rocks above.

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