Rocks
What are the type of fossil that makes it easy to tell the age of the rock.
What is trilobites?
True or false: Erosion can be the reason for a gap between the geologic record of layers of rock.
What is true?
What is an effect of a large volcanic eruption that produces a large amount of ash.
What is key beds are are formed from the ash?
What is a way that scientists can tell the surface of the Earth has changed.
Possible answers: They can examine layers of rocks and the fossils in them, they can see how rock layers change when mountains are formed, they see that rivers can carve and change layers of rock by forming canyons?
What is a key bed.
What is a layer of rock with unique characteristics that scientist can easily identify. They help with aging the rock layers and fossils around them?
What are the different layers of rock called.
What is strata?
What is a way to tell that the land changed from an aquatic environment to a dry, land environment.
What are the deeper layers (older) have fossils of sea creatures, while the layers above (younger) have fossils of land creatures?
What do water, wind, ice, heat, plants, and gravity do to rocks.
What is weather/erode?
What is how scientists know that rock layers are the about the same age.
What are the layers have the same type of fossils within them?
How are petrified fossils made.
What is minerals take the place of cells in a dead organisms remains?
What are index fossils.
What are fossils that are only found in one layer of rock and used to determine the age of rock layers?