Question

Which Highlands are made up of shield rocks​

Answer 1

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A shield is a large area of exposed Precambrian crystalline igneous and high- grade metamorphic rocks that form tectonically stable areas. These rocks are older than 570 million years and sometimes date back 2 to ... It is estimated that over 50% of Earth's shields surface is made up of gneiss.

Answer 2

Explanation:

A shield is a large area of exposed Precambrian crystalline igneous and high-grade metamorphic rocks that form tectonically stable areas.[1] These rocks are older than 570 million years and sometimes date back 2 to 3.5 billion years.[citation needed] They have been little affected by tectonic events following the end of the Precambrian, and are relatively flat regions where mountain building, faulting, and other tectonic processes are minor, compared with the activity at their margins and between tectonic plates.