Define the cambrian?
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What layer of the earth does magma form?
What is the name of the largest volcano in the world?
What is potash?
What is concentrate?
Explain what did radon detection in arid areas can help to explore?
Throw some light on water temperature in oceans and its effect on marine life.
In 1763, how did great britain try to end troubles with the native american?
What is conductors?
What is ore?
Explain why does a glacier move?
Were there super continents before pangea?
What is lava?