Geologic Timescale Test

The Geologic Time Scale is best described as:

• Layers of metamorphic rock

• Layers of igneous rock

• Number of sedimentary rock layers

• The record of major life forms and geologic events in Earth History as seen in rock layers

Hannah and Elijah are comparing the ages of different rock layers they found during a field trip. Relative age is

• a specific date in the rock record

• atomic time

• the time it takes for an animal to become extinct

• the age of rock compared to the ages of other rock

The first Tyrannosaurus Rex was seen 68.5 million years ago (mya). What type of time is this?

• Relative Time

• Absolute Time

• Historical Time

• About Time

Which of the following is not a good characteristic of an index fossil?

• easily recognizable – they are different from other fossils

• they are all mammals

• they lived over a large area of the earth

• they lived only during a short period of time in earth’s history

Known as “Early life” it is when there is much change on Earth and the emergence of complex life.

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

• Late life

Is the present Era where mammals became dominant and humans appeared on Earth.

• Mesozoic Era

• Paleozoic Era

• Precambrian Time

• Cenozoic Era

• mammals became dominant

End of this era was believed to be caused by an asteroid colliding with Earth, causing a huge cloud of dust, blocking out the sun.

• Precambiran Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Known as "Middle Life" it includes the age of the dinosaurs

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Long time Period during early Earths formation- very primitive single celled and multicellular life forms

• Precambrain Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

How did Earth change about 2.5 billion years ago when many organisms began using photosynthesis to make food?

• The amount of oxygen in the atmosphere increased.

• Mass extinctions occurred.

• The oceans became larger.

• Rainfall increased.