A scientist is observing a rock found near a crater where an asteroid once collided with Earth. The scientist wants to determine if the rock they are observing is from Earth or from the asteroid. The oldest rock on Earth is 4.5 billion years old. The rock from the asteroid is much older than rock on Earth. The scientist uses U-235 U-Pb dating on the rock and finds that 55% of the uranium-235 in the rock has changed to lead-207. Which statement is best supported by the scientist's evidence?
A scientist tests a zircon crystal using the U- 235 method. The sample contains 50% uranium- 235 and 50% lead- 207 How old is the zircon crystal?
An archaeologist finds evidence of early human activity in a cave. This evidence includes volcanic rocks that were used for tools and charred seeds from a fire pit. The archaeologist uses carbon-14 dating on the seeds and uranium-235 dating on the rock tools. The seeds contain no carbon-14 but large amounts of nitrogen-14. The rock tools contain large amounts of uranium-235 and only tiny amounts of lead-207. When were early humans most likely living in the cave and using the seeds and tools?
Match each dating method with the appropriate application.
K-Ar|radiocarbon|Rb-Sr
Hundreds of miles away, another researcher discovers a palm fossil in a layer of sedimentary rock 2 meters below the ground surface. What can this researcher infer after looking at the archeologist's data?
A geologist studied rock layers exposed near the side of a road. Layer A is at the ground surface. Layer B is located below Layer A. Layer C is located below Layer B. The geologist collected a sample of the rock from Layer B and used U-238 U-Pb dating to determine the rock was approximately 600 million years old. Choose the correct answer from each drop-down menu to complete the statements.
older|the radiometric dating data|less than 600 million years old
Radiocarbon dating uses the conversion of carbon-14 to nitrogen-14 to date organic materials that are less than 50,000 years old. The half-life of carbon-14 is 5,730 years. Which statement best explains why radiocarbon dating cannot be used on objects that are 80,000 years old?
A scientist is observing a rock found near a crater where an asteroid once collided with Earth. The scientist wants to determine if the rock they are observing is from Earth or from the asteroid. The oldest rock on Earth is 4.5 billion years old. The rock from the asteroid is much older than rock on Earth. The scientist uses U-235 U-Pb dating on the rock and finds that 55% of the uranium-235 in the rock has changed to lead-207. Which statement is best supported by the scientist's evidence?
A geologist has evidence that a large volcanic eruption occurred long ago and wants to better understand its effects. They plan to use relative and absolute dating techniques to learn more about the volcanic eruption. Classify each question based on whether it could be answered by relative or absolute dating techniques.
Did the volcanic eruption happen before or after the extinction of trilobites?,Did the volcanic eruption occur before mammals lived in this area?|Did the volcanic eruption happen between 100 and 110 million years ago?,How old is the eruption's volcanic ash that is contained in an ice core?
Which of these geologic layers is oldest?
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