Rock Record & Geologic Timeline

Radioactive decay occurs at a:

As climates changed, this mechanism drove organisms to either evolve or become extinct.

The quantification of radioactive isotopes is used in:

Which is the oldest layer in the picture?

What is a mineral?

This was formed during the Paleozoic era:

The development of warm, shallow seas may have caused:

Which is not a period of the Mesozoic Era?

Which type period of rock is severely damaged?

Giant insects flourished during the Carboniferous Period because of:

What marked the end of the Paleozoic Era?

An Intrusion is always older than the rocks it cuts through.

The trilobite is considered to be the most famous:

The Age of the Reptiles is:

What do the fossils in layer A represent?

What era did Pangea form?

The two most common elements in the Earth's crust are oxygen and

Vertebrates first appeared during which time period?

Take your time! Which letter represents the most recent layer/event?

Scientists use __________ to explain Earth's history by comparing it to present day processes:

A unit of geologic time in which a period is divided:

The Precambrian time covers ______% of the Earth's history.

The gradual development of new organisms from preexisting organisms is called:

The principle that states the oldest rock layer is at the bottom of the geologic column. 

What is the oldest evidence of the modern human?

What part of the mantle isless dense and flows like heated plastic? 

What measurement of time is larger than periods?

Wooly mammoths lived during which era?

Which of the following describes an intrusion through a layer of sedimentary rock?

Cooler, drier climates of the end of the Mesozoic allowed which animal to evolve and diversify?