If the same types of fossils are found in two separate rock layers, it's likely that the two rock layers ___________.

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

Gaps in rock layers are called _________.

A limestone bed containing fossils that are 550 million years old is ______ a bed of sandstone containing fossils that are 400 million years old.

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

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

If a layer of sandstone lies on top of a layer of limestone in which a 300 million year old fossil is found, and there are no unconformities, the layer of sandstone must be ________.

Geologic time is divided into units based upon types of _________.

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

__________ existed during the Mesozoic Era.

A life-form in the Precambrian time was __________.

Trilobites are index fossils because they _________.

Pangaea separated into ________.

Little is known about much of Earth's early history because ________.

Animal life in the Paleozoic Era included which of the following ?

Animal life in the Cenozoic Era includes ___________.

__________ on the geologic time scale are marked by major, striking, and worldwide changes in the type of fossils present.

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

Humans first appeared during the ___________ Era.

The longest division of time in Earth's history is known as __________.

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