How can rocks be folded up?
Most rocks are too brittle to be reshaped, but folding is common in sedimentary rocks. Movements in the Earth’s crust force flexible sedimentary rocks into folds. These folds are sometimes so large that the rock lays back on itself in layers. Geologists may find that the layers of rock are actually upside down, with the youngest rocks on top.
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What is a mountain range?
A group of mountains is called a range. Nearly all large mountains are grouped in ranges. Single high peaks are usually old volcanoes. Mount Kilimanjaro in Tanzania is the highest mountain in Africa. It is a single peak, and is an extinct volcano. These isolated peaks always look much higher than mountains in ranges, because they are not surrounded by the usual lower foothills that disguise their true height.
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