1. when looking at a satellite image, do clear areas (no clouds) signify rising air or sinking air? 2. what direction does air move around an area of high pressure? 3. what direction does air move around an area of low pressure? 4. what is a cold front? 5. what is a warm front?

1. Clear area signify sinking air.
Sinking air is created through divergence of air at the surface out the areas with high pressures.
If being observed through satellite, the process would cause the sky area to become more clear with no clouds spotted.

2. The answer is clockwise.
This happens because of the Coriolis effect. As the earth rotates,  The spin will create the wind to Curve to the right. This will lead to winds blow clockwise around within the area that has high pressure

3 The answer is Counterclockwise
The explanation is similar to number 2 but now it has to counter the opposite direction, which also cause the opposite direction of the air movement.

4. Cold front is the movement of mass of cold air, which trails from the sector of low temperature (and low pressure system). It usually move from northwest to southeast and will decrease the average temperature of the region that it passed.

5. Warm front is the movement of mass of warm air and will create a transition to replace the cold air. It usually move move from southwest to northeast and will increase the average temperature of the region that it passed (which will create perfect condition for many type of plants to grow)

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