Fossils, Geologic Time, Adaptations

Match it! Select the correct answer from the pull down...Good luck!

The division of Earth's history into smaller units makes up the _______.

A life-form in the Precambrian time was __________.

Rock layers are related if they both contain the same _________.

Trilobites are index fossils because they _________.

In a series of undisturbed rock layers where shale lies between sandstone below and limestone above, the ________.

The longest subdivision in geologic time is a(n) ________.

Gaps in rock layers are called _________.

Determining the order of events and the relative age of rocks by examining the position of rocks in a sequence is called ______________.