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Answer:
The magma that melts in the upper mantle and erupts at the mid-ocean ridge has a different composition (higher in Ca, Mg, Fe and relatively lower in Si and Al) than the composition of the magma (more Si, Al, Na, K rich in relative terms) that built the continents. Melting different degrees (2%, 5%, 30%) of a rock with a mantle-like composition generates magma of different Al, Si contents. Continents grow at their edges by partial melting of oceanic crust that is being subducted, generating magmas of a somewhat more Si, Al-rich composition than the subducting slab itself. The chemistry and physics of melting a mixture of minerals rather than one homogeneous substance has the wonderful outcome of creating two distinct types of crust:
Answer:
In addition to looking at the features of places, geographers examine how those features interact. In particular, they want to understand how people interact with their environment—how people and their physical environment affect each other. An area's environment includes its land, water, climate, plants, and animals.
Explanation:
Answer:
A proper fraction is a fraction whose numerator is smaller than its denominator 3/4, 2/11, and 7/19 are proper fractions
UNFCC or United Nations Framework Convention on Climate Change <span>has played the most significant role in solving global environmental problems. This is basically an international treaty on environment that was signed in Rio de Janeiro between 3rd to 14th of June in the year 1992. I hope the answer has helped you.</span>
