Answer:
Students in AP World History must learn to view history thematically. The course is organized around
five overarching themes that serve as unifying threads throughout the course, helping students to relate
what is particular about each time period or society to a “big picture” of history. The themes also provide
a way to organize comparisons and analyze change and continuity over time. Consequently, virtually all
study of history in this class will be tied back to these themes by using a “SPICE” acronym.
Explanation:
Answer:
Partial melting occurs when only a portion of solid is melted. It is thus enriched in the chemical components of minerals with lower melting temperatures and the remaining unmelted portion of the rock is composed of minerals with highest melting temperatures. Partial melting preferentially enriches melts with incompatible elements.
Partially melted rock do not usually experience complete melting inside the Earth, due to their different chemical composition and their melting points.
It is thought that partial-melting processes play a major role in generating more-defined liquids from less-evolved ones, so that many basalts may be the result of partial melting in the upper mantle, and many granites may have derived partly or completely from the partial melting of continental crust (anatexis).With increasing temperature and pressure, the subducted oceanic crust (of basic composition) first undergoes metamorphism and then begins to melt or release watery fluids; this material rises into the overlying mantle, which may also begin to melt, giving rise to intermediate magma.
Afghan refugees living in Iran to escape terrorism - Push factor
Bangladeshi migration to India due to flood - Push factor
Admission to university in England - Pull factor
Migration to Canada for a better lifestyle - Pull factor
Migration to America to escape religious persecution - Push factor
Entrepreneur moving to Singapore for a better business opportunity - pull factor
Answer:
Two ways to reduce wind erosion are: Covering the Surface of the Soil and Making use of Shelterbelts.
Explanation:
Wind erosion is a natural activity where a soil is moved from one place to another mainly because of the wind power. If so happens that a strong blow of wind comes and takes away with it the volume of soil particles and transfers it to other place creating dust storms.
Wind erosion can be reduced by Covering the Surface of the Soil. This can be done by growing vegetation which will protect the soil by the keeping the wind off the soil surface. Another way to reduce wind erosion is by making use of Field Shelterbelts. Shelterbelts are the best way because it not only reduce the wind erosion but at the same time it also conserve the soil moisture. Shelterbelts is a planting method where fields are planted in rows of varied crops.
