11 Biology Mod 3 Biological Diversity Dating Rocks and Fossils

What is the primary learning intention of the video?

• To learn about the music history

• To investigate using secondary sources evidence in support of Darwin and Wallace's theory of evolution

• To study the effects of greenhouse gases

• To understand the geological laws

What does relative dating allow scientists to do?

• Determine the exact age of fossils

• Compare the positions of rocks or fossils to make conclusions about them

• Calculate the speed of continental drift

• Identify the chemical composition of fossils

What does the law of superposition state?

• Fossils can be found in any layer of rock

• Rocks of the same age are found in different locations

• In an undisturbed column of rocks, the oldest rocks will be at the bottom

• The youngest rocks are at the bottom of an undisturbed column

What is the significance of stratigraphic correlation?

• It is used to correlate rocks and fossils of similar ages in different locations

• It helps in determining the chemical properties of rocks

• It is a method for dating volcanic eruptions

• It defines the layers of the atmosphere

What are index fossils?

• Fossils that are geographically widespread but occur over small periods of geological time

• Modern organisms that have not evolved

• Fossils that are rare and found in only one location

• Fossils that are geographically widespread and occur over very long periods of geological time

Why are crocodiles not considered good index fossils?

• Because they are not widespread geographically

• Because they are only found in aquatic environments

• Because they have evolved significantly over time

• Because they occur over very long periods of geological time

What is the main difference between relative dating and absolute dating?

• Relative dating can only be used for dating fossils, not rocks

• Absolute dating can determine the exact age of rocks using the property of radioactive isotopes

• Relative dating uses radioactive isotopes to date rocks

• Absolute dating is less accurate than relative dating

What is the half-life of Carbon-14?

• 100,000 years

• About 5,700 years

• 10,000 years

• 1 million years

Why is Carbon-14 dating not useful for materials older than about 57,000 to 60,000 years?

• Because Carbon-14 does not exist in older materials

• Because Carbon-14 becomes too radioactive after 60,000 years

• Because the amount of Carbon-14 remaining is too small to be accurately measured

• Because older materials do not contain carbon

What does the presence of a particular index fossil in a rock layer indicate?

• The chemical composition of the rock

• The exact geographical location where the rock was formed

• The age of the rock can be accurately determined

• The rock is not suitable for radioactive dating