Geologic History

How old is the Earth?

• ~3.6 billion years ago

• ~4.6 million years ago

• ~4.6 billion years ago

• Last Saturday

States that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.

• Macroevolution

• Radiometric dating

• Law of Superposition

• Microevolution

There is good evidence that a meteor hit Earth about 65 million years ago. Which of the following events that scientists think were triggered by the impact could have caused the simultaneous global extinctions of multiple species, including all the dinosaurs?

• The meteor was large enough to trigger powerful earthquakes.

• The impact itself triggered global tsunamis.

• Volcanic eruptions were set off by the impact.

• Atmospheric debris changed global climates for months or years.

What organism evolved first?

• bird

• trilobite

• whale

• dinosaur

• fish

The age of Reptiles was the

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

• Precambrian Era

The age of Mammals is the

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

• Precambrian Era

___________________________ are a rapid decrease in biodiversity that's usually followed by a rebound in biodiversity and a change in the type of dominant organism.

• Mass extinctions

• Gradualism

• Punctuated Equilibrium

• Dynamic Equilibrium

What is mass extinction?

• The extinction of many organisms in one species over a short period of time

• The extinction of many species in a short period of time

• The extinction of many species in a long period of time

• The death of many organisms in a short period of time

What are Eons

• Subdivisions of Eras

• Subdivisions of Periods

• Subdivisions of Epochs

• The longest unit of geologic time

Life has been evolving for...

• Hundreds of Thousands of Years

• Millions of Years

• Billions of Years

• Billions of Months

• Since you were born