Rock Record & Geologic Timeline

The trilobite is considered to be the most famous:

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

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

Vertebrates first appeared during which time period?

What marked the end of the Paleozoic Era?

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

What is the oldest evidence of the modern human?

Wooly mammoths lived during which era?

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:

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

What measurement of time is larger than periods?

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

Amber found in rocks is:

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

Which is the oldest layer in the picture?

Cyanobacteria that filled the atmosphere with oxygen are called:

Most of our valuable minerals (nickel, iron, gold, copper) are found in rocks from the: 

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

What is the layer of sedimentary rock between his thumb & index finger called?

Which type period of rock is severely damaged?

The quantification of radioactive isotopes is used in:

Giant insects flourished during the Carboniferous Period because of:

The development of warm, shallow seas may have caused:

Which is not a period of the Mesozoic Era?

What do the fossils in layer A represent?

What is a mineral?

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

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

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

Radioactive decay occurs at a:

What era did Pangea form?

The Age of the Reptiles is:

The region of sedimentary rock between the man's thumb & index finger indicates ___ year(s)?

This was formed during the Paleozoic era: