Unit 7 & 8 Earth Science

When an organism leaves carbon dusting remains on a rock, this preservation is called?

how old must something be to be a fossil?

Law of Crosscutting: layer of rock cuts through another rock is _____

Unstable original radioactive material

what type of rock are fossils usually found in?

major resource is coal, rugged area of VA

caves are found in what region of VA

age of mammals

oldest mountains in VA

half the time it takes for radioactive material to decay

Law of superposition: layers on the bottom are

rolling hills in VA

age of invertebrates

gap in the rock record

Stable product of radioactive decay

if one half-life has passed ____% of the parent material remains.

Age of reptiles

Oldest and longest era

boundary between Coastal Plain and Piedmont

present era

which region has the delmarva peninsula?

smallest unit of geological time?

if the half life of C14 is 5,730 years and 11,460 years have passed, how many half lives is it?

flat, wet, sedimentary rock, on the eastern most part of VA

How old is the Earth?