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:
India spreads along two distinctive time zones +UTC5:00 and UTC+6:00. In any case, India needed to proceed with a similar time all through the entire nation and hence thought of UTC+5:30 which is the normal of the above. In spite of the fact that this works decently pleasantly for the various parts of India, it doesn't function admirably for the northeastern states.
Answer:
B. Functional Region
Explanation:
Functional regions have boundaries related to a practical function within a given area. When the function of an area ends, the functional region ends and its boundaries cease to exist. For example, a functional region can be defined by a newspaper service or delivery area. If the newspaper goes bankrupt, the functional region no longer exists. Church parishes, shopping malls, and business service areas are other examples of functional regions. They function to serve a region and may have established boundaries for limits of the area to which they will provide service. An example of a common service area—that is, a functional region—is the region to which a local pizza shop will deliver. A functional region is a region that serves a function. Places within in an area are linked together through a common factor. For example, a city and its surrounding suburbs creates a functional region. People generally move to the suburbs if they have a job in the city.
