Explanation:
Rocks can be classified in to three main groups - igneous, sedimentary and metamorphic. These three different rock types can be found in distinct areas of the UK. Igneous rocks - these rocks are a result of volcanic activity in the past, when Britain was close to a plate boundary.
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Your question: What physical feature marks the eastern boundary of the cultural subregion known as European Russia..?
Your answer: The Ural Mountains physical feature marks the Eastern boundary o f the cultural subregion known as European Russia.
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A steppe is a large expanse of grasslands and few trees. So the choice of grassland with few trees would be your answer.
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