an object made by shaping molten metal or similar material in a mold
Amber
fossilized tree resin
Half-life
he time taken for the radioactivity of a specified isotope to fall to half its original value.
Original horizontality
states that layers of sediment are originally deposited horizontally under the action of gravity
Absolute Age
the true age of a rock or fossil
Outgassing
To remove embedded gas from (a solid), as by heating or reducing the pressure
Orogeny
a process in which a section of the earth's crust is folded and deformed by lateral compression to form a mountain range.
Supercontinent
each of several large landmasses (notably Pangaea, Gondwana, and Laurasia) thought to have divided to form the present continents in the geological past.
Lateral Continuity
states that layers of sediment initially extend laterally in all directions; in other words, they are laterally continuous
Relative age
common practice for dating rocks, science of determining the relative order of past events
