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Rock layers with the same  index fossils must have formed  at about the same time .The presence of more than one type of index fossil provides stronger  that rock layers  are the same  age.

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i think they know by seeing if each rock is the same color and pattern as the others. i think they also know if they have the same detailing in a specific are, where they could've been split.

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They are at the same height and they have the same fossils

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we can tell that rock layers that are far apart were formed at the same time because they would have similar organisms fossils inside the rock layer and they would most likely be the same color and would have similar features to each other.

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maybe because of the color or the type of fossils

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maybe because of fossils that are in the rock's layers

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because of their color

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¿Cómo crees que los geólogos saben que las capas de roca que están muy separadas de otras se formaron al mismo tiempo?

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How do you think geologists know that rock layers that are far apart from each other formed at the same time?