Earth History and Hydrosphere Review EOG

states that younger rock is found above older rock when comparing undisturbed sedimentary rock layers

• law of superposition

• trace fossil

• matter can't be created or destroyed

• atoms

A technique used to determine the actual age of a fossil

• relative dating

• absolute dating or radioactive dating

• rock layers

• index fossils

Which best describes a fossil that helps determine the relative age of a rock layer?

• trace fossil
• index fossil
• radioactive fossil
• unconformity fossil

The index fossil of a type of trilobite is discovered in layer A of a set of rock layers found at three different sites of a field investigation. Which conclusion can be made about the rocks in layer A at all three sites?

• The rocks are all different ages
• The rocks are all about the same age
• The rocks were formed from melting magma
• The rocks were formed during a catastrophic event

Which method provides the most accurate age of a rock sample?

• superposition
• relative dating
• radioactive dating
• index fossil identification

Fossil remains of a trilobite are most likely to be found in which type of rock?

• igneous
• volcanic
• sedimentary
• metamorphic

The half-life Carbon-14 is 5,730 years. How much parent material is left after 5,730 years?

• 75%
• 50%

Index fossils are useful for determining the relative age by ...

• a narrow time range and a wide geographic range
• a narrow time range and a narrow geographic range

Which is the most recent era of time- the one that we are currently in?

• Mesozoic 
• Paleozoic 
• Cenozoic 
• Precambrian 

Which era is known as the "age of reptiles"

• Paleozoic Era
• Cenozoic Era
• Mesozoic Era
• Precambrian Era