Determine whether each statement describes relative age or absolute age.
sam bought a new car seven
years ago today.
sarah's company was formed
a few years after james's
company.
luke's school was built in
december, 100 years ago.
alice's school is older
than luke's school.
louisa owned a car long
before sam.
james's company has been in
existence since 1991.
relative age
absolute age

Sam bought a new car seven years ago today - absolute age
Sarah s company was formed a few years after James’s company - relative age
Luke’s school was built in December, 100 years ago. - relative age
Alice’s school is older than Luke’s school - relative age
Louisa owned a car long before Sam - relative age
James’ company has been in existence since 1991 - absolute age

relative age - the age of an event is determined in relation with another event (or another person)

Absolute age - the age of an event is a fixed moment in time, which can be traced back with precision and does not depend on another event, person or age

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. 

Did you know it's illegal to own only one guinea pig in switzerland?   : )