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Changes Over Time
7th Grade Unit 16
| Term | Definition |
|---|---|
| Fossil | the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers |
| Trace Fossil | fossil that provides indirect evident evidence of ancient plants or animals, such as footprints, nests, burrows, or feces |
| Mid-Ocean Ridges | a chain of underwater volcanoes that forms the longest mountain range on Earth |
| Ocean Basin (Trench) | a large, bowl-shaped depression in the Earth's surface that's filled with water |
| Fossil Record | a collection of fossils that document the history of life on Earth |
| Law of Superposition | in a sequence of sedimentary rock layers, the oldest layer is at the bottom and the younger layers are stacked on top |
| Strata | layers of rock or sediment that are separated by visible surfaces |
| Relative Dating | determining if one object or event is older or younger than another, without knowing their exact age, usually by analyzing their position in a sequence of layers |
| Ocean Trench | a long, deep depression on the ocean floor formed where one tectonic plate slides beneath another (subduction), creating a steep, V-shaped valley that marks the deepest parts of the ocean, often found along the "Ring of Fire" around the Pacific Ocean |
| Pangaea | a supercontinent that existed from about 300–200 million years ago |
| Plate Tectonics | the scientific theory that the Earth's crust is broken into large plates that move over time |
| Seafloor Spreading | a geologic process that occurs at mid-ocean ridges when tectonic plates move apart, creating new seafloor |
| Index Fossils | the remains of plants and animals that have existed only for a limited geologic period. They are used to narrow down the age of the rock containing them and correlate rock layers across different locations. |
| Relative Age | determining if something is older or younger than another object, without knowing their exact ages, usually by comparing their positions within a sequence of layers or events |
Created by:
klstorie
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