1 Which two of the following sentences from the article BEST represent CENTRAL ideas?
1. Although they are incredibly useful, all maps leave out or alter
certain information
2. If Earth were fiat, it could easily be displayed on a flat surface.
3. They are attractive, general-purpose maps with less exaggeration
and are widely used in classrooms and textbooks.
& Maps have often reflected the interests of powerful people.
(A)
1 and 3
(8)
1 and 4
I
2 and 3
2 and 4

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust. 

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years