Quiz #9 Part 2

Age of rock compared to other rocks

Lava hardens on the surface, rock below is older

Magma that pushes up from underneath, rock around it is older

Gaps in the geological record or rock sequence where old rocks meet much newer rocks

Fossils of widely distributed organisms that lived during a small period of time and used to determine relative age of other fossils

Break in Earth’s surface

Actual number of years since a rock formed

Radioactive decay

Element releases energy and turns into another element

Sedimentary rocks, too many types of sediment/different rock pieces

Amount of time it takes for half of the elements to turn into another element

Looks like a fish, point where the lines intersect is the half life