Explain what makes mountains appear purple?
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Explain how do minerals become rocks and rocks become soil?
Why did the continents spread apart?
What is sedimentary rock?
Define china clay?
why a cloud appears as black cloud and white cloud
How many seismograph stations are needed to allocate the epicenter of an earthquake?
Explain techno-fossils?
What is igneous rock?
What is rock quarry?
What did radon detection in arid areas can help to explore?
Define shale?
explain tsunami formation shortly