Diamonds are found on continents and are associated with past volcanic activity. Cratons, which are the oldest parts of a continent, are especially favorable for hosting diamonds because they are older than the newer crust. As the older crust contained volcanoes, kimberlite and lamproite magmas transported the diamonds to the surface. When these old volcanic magmas called kimberlite pipes are uncovered, they are susceptible to weathering, leaving the diamonds exposed on the surface of the Earth.
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