Earth History 8th Grade

These are the flashcards I have created for the menu. Hope they are cool enough in a cool enough website.

17 cards·by kassy.m.z

Fossil

remains or traces of plants and animals that lived long ago.

Molds

the soft and hard parts of the organism disappear leaving an empty space with the same shape as the organism

Fault

Breaks or cracks in rock that cause layers to be offset from one another.

Casts

a mold is filled in by minerals in the sediment

petrified fossil

fossils that have been turned into stone

original remains

decay was stopped completely or slowed to almost zero thus preserving the whole organism

ice cores

a cylindrical or tubular sample of ice

index fossils

Any fossils discovered by scientists are approximately the same age as the rock they arefound within.

fossil record

evidence of fossils in the layers of rock

carbon film

after an organism has been pressed on a rock and has decayed fully, it will leave a thin film ofits carbon behind on the rock or surface

tree rings

each ring in the trunk of a tree represents a single year

trace fossil

marks or evidence of animal activities that have become fossilized

precambrian

the first era of earth’s time

cenozoic

new mammals appeared while others became extinct

paleozoic

vertebrates and land plants first appeared

mesozoic

dinosaurs are present and the first birds, mammals, and flowering plants appear

law of superposition

States that older rock layers are located beneath younger rock layers in a series ofundisturbed sedimentary strata