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In which time era are we currently living?

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Preserved remains of plants and animals from the remote past are called?

• Sedimentary rocks

• Radioactive dating

• Decayed organisms

• Fossils

The Law of Superposition states

• Younger rocks layers are on top of older rock layers

• Fossils are found in sedimentary rocks

• Older rock layers are on top of younger rock layers

• Absolute age dating

Which era was the longest, taking up 88% of geologic time?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

The end of an era, and the end of life for groups of organisms, is called?

• Death

• Mass extinction

• Transition

• Turning point

What two methods are used for determining the age of rocks and fossils?

• Relative and Absolute Dating

• Carbon and Water Dating

• Sedimentary and Igneous Rocks

• Spatial and Layered Dating

How is the geologic time scale divided?

• eons, eras, and periods

• eons, eras, and ages

• Centuries, eras, and periods

• Millenniums, eras, and periods

What does relative age tell us about a rock layer or fossil?

• The age of one rock layer or fossil compared to another.

• The relative age of a fossil determined by radiometric dating

• Younger rock layers sit on top of older rock layers

• Older rock layers sit on top of younger rock layers

Time periods are defined by__

• Types of dinosaurs

• Events on Earth at that time

• Time zones

• Specific dates

How do we still learn about new aspects of the geologic time scale?

• New fossils and technology

• By studying birds

• Through plate tectonics

• By rotations of the earth