Gross domestic product (gdp) is a measure of how much a country produces. how does improved technology increase a country’s gdp?
a.
improved technology allows workers to take more time off.
b.
improved technology sometimes means that certain jobs won’t be needed anymore.
c.
improved technology makes it easier to communicate with people around the world.
d.
improved technology allows workers to produce more goods and services each year.

A- taking more time off won't help increase the GDP
B- taking out certain jobs may negatively affect the GDP
C- Communication really doesn't affect the GDP
D- Producing more goods and services each year definitely will increase the GDP.
Therefore, the answer is D.

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.