Earth's Landscapes

What provides evidence of past life?

• microscope

• books

• weather data

• fossils

Answer explanation

Fossils provide evidence of past life as they are the preserved remains or traces of organisms from previous geological periods, allowing scientists to study and understand ancient life forms.

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What is a rock layer with lots of skeletons called?

• bone bed

• bone pile

• river bed

• biological layer

Answer explanation

A rock layer with lots of skeletons is called a 'bone bed.' This term specifically refers to a concentration of fossilized remains, distinguishing it from other terms like 'bone pile' or 'river bed,' which do not have the same meaning.

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Which rocks are the youngest in this photo?

• the rocks at the top

• the rocks at the bottom

• the rocks on the right side

• the rocks on the left side

Answer explanation

The rocks at the top are the youngest because, in geological terms, the layers at the top are formed last, while those at the bottom are older due to the process of sedimentation and layering over time.

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How do scientists accurately determine how old a fossil is?

• count rings

• radiocarbon dating

• radio waves

• compare to other fossils

Answer explanation

Scientists use radiocarbon dating to determine the age of fossils by measuring the decay of carbon-14 isotopes. This method is effective for dating organic materials up to about 50,000 years old, making it the correct choice.

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What is a slow change to Earth's surface?

• a flood

• an earthquake

• weathering

Answer explanation

Weathering is a slow process that breaks down rocks and minerals on Earth's surface over time, unlike floods and earthquakes, which are rapid events. Therefore, weathering is the correct answer for a slow change.

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The diagram below shows the undisturbed layers of rock found in an area and some of the fossils found in each layer.

Which layer would have the oldest fossils?

• Layer N

• Layer M

• Layer O

• Layer L

Answer explanation

Layer O is the lowest layer in the diagram, indicating it was formed first. Fossils found in deeper layers are older than those in layers above, making Layer O the one with the oldest fossils.

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Sometimes paleontologists find fossils in different rock layers that have characteristics very different from the fossils they have already cataloged in that area. What would the scientists most likely conclude?

• The new find was moved from its original location by animals.

• The new find is not a fossil.

• The new find existed at a different time.

• The new find has been incorrectly identified.

Answer explanation

The presence of fossils with different characteristics in various rock layers suggests that the new find existed at a different time, indicating changes in the environment and species over geological periods.

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The diagram below shows a cross-section of underground rock layers at a particular location on Earth. The rock layers have formed over the course of millions of years. Each rock layer is labeled with a letter. Layer A is the top layer. 

Scientists have made the following discoveries about this cross-section of rock layers. 

• Scientists found fossils of trees and land animals throughout Layer A.

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• Scientists found fossils of plants but no fossils of animals in Layer B. 

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• Scientists found fossils of ocean animals throughout Layers C, D, and E.

Based on the information above, which rock layer most likely contains fossils of organisms with four legs?

Responses

• 
  

• Layer B

• Layer A

• Layer C

• Layer D

Answer explanation

Layer A contains fossils of trees and land animals, which likely includes organisms with four legs. In contrast, Layer B has only plant fossils, and Layers C, D, and E contain ocean animals.

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Examine the different environments. Select the area where it would be the easiest to find fossils from millions of years ago?

• 
• 
• 
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Several teeth were found in an area of flat land covered with trees and plants. The teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. They found many other shark teeth in this area. However, the people who discovered the teeth were puzzled. There was no source of water near where the fossils were found.

What is the paleontologist's BEST explanation for why the teeth were found in this area?

• Sharks used to live on flat land.

• This area was once covered with salt water.

• This area was once covered with freshwater.

• Someone buried the shark teeth deep in the ground.

Answer explanation

The paleontologist's best explanation is that this area was once covered with salt water, as sharks are marine animals. The presence of shark teeth indicates that the region was likely underwater in the past.

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