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| These are traces or remains of living things from long ago. |
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| Most fossils are made of these. |
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| These are fossils that are the actual bodies or parts of organisms. |
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| These are two locations where 10,000 year old mammoths have been found preserved in ice. |
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| Amber, which preserves small insects, is hardened ____________________. |
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| This is one of the world's most famous fossil locations. |
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| Fossils form mostly in this type of rock. |
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| An organism dies and falls into soft sediment. Eventually, the sediment becomes rock and the organism decays. This is the process of ____________________ formation. |
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| These are made when minerals fill molds. |
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| Examples of these would be footprints, trails, holes and scat. |
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| T-Rex was a slow runner. What modern animal did scientists build a model of to gain this information? |
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| Name two things that scientists analyze to study past weather patterns. |
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| This is a stone fossil of a tree |
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| This is the age of an object in comparison with other objects. |
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| Over time, sedimentary rocks form ____________________ layers. |
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| In sedimentary layers, where is the oldest rock? |
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| What other type of rock could cause sedimentary rock to become disturbed? |
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| These are large bodies of igneous rock that form when magma is injected into surrounding rock, then cools. |
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| These are fossils of organisms that were common, widespread, and that lived in a particular span of time. |
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| The most useful index fossils are of what type of organism? |
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| nautilus, brachiopod, cephalopod |
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| Name three organisms that provide us with useful index fossils. |
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| This is the actual age of an event or an object. |
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| Atoms of an unstable element break down into a stable form. What is this called? |
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| This is defined as the length of time it takes for half of the atoms in a sample of an unstable element to change into a stable form. |
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| Since this element is a part of every living thing, we use it in radioactive dating. |
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| They are made of many different types of rocks. |
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| This is why we cannot use radioactive dating on sedimentary rocks. |
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| He was the Scottish scientist who first hypothesized that the Earth was always changing. |
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| Hutton's theory, states that the same forces that changed the Earth in the past are still changing the Earth today. |
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| This divides the Earth's history into intervals of time defined by major events or changes. |
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| Fossil evidence shows that humans have been around for how many years? |
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| This is the largest unit of geologic time. |
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| The Hadean, Archaen, and Proterozoic eons are called Precambrian time and make up how much of Earth's history? |
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| Life in Precambrian time consisted mostly of these. |
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| Pangaea formed in this era. |
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| The dinosaurs ruled the Earth in this era. |
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| Fossils of the first humans were found in this time. |
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| Through radioactive dating, scientists know that the Earth is how old? |
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| The oldest evidence of life on Earth comes from fossils dating back this long. |
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