A Trip Through Geologic!

5. Study of fossils
7. Earth’s continents moved together to form a great landmass.
11. Age The number of years since the rock formed.
13. The type of rock that is made of hardened sediment.
15. All the matter you see, including rocks, is made of tiny particles called ________.
18. Elements break down, or decay, by releasing particles and energy in a process called _______.
19. ______ are the preserved remains or traces of living things. _______ provide evidence of how life has changed over time.
22. Theory well tested concept that explains a wide range of observations.
23. Fossils Provide evidence of the activities of ancient organisms.
24. Ball of dust and ice that orbits the sun
26. Animal that lives part of its life on land and part of its life in water.
29. Continental movement over Earth’s surface because of forces inside Earth.
30. An _________ is always younger than the rock layers around and beneath it.

1. warmblooded vertebrate that feeds its young with milk.
2. Many types of living things became extinct at the same time.
3. Help geologists match rock layers.
4. A hollow area in sediment in the shape of an organism or part of an organism.
6. A radioactive form of carbon.
8. Rock Forms when magma or lava hardens.
9. Forms when living things die and are buried by sediments.
10. Covers about eighty eight percent of Earth’s history.
12. Forms when the hard part of an organism, such as a shell, is buried in sediment.
14. scaly skin and lay eggs with tough, leathery shells.
16. A record of the life forms and geologic events in Earth’s history.
17. a break in Earth’s crust.
20. Divided time between Precambrian Time and the present into three long units.
21. Fossils in which minerals replace all or part of an organism.
25. The gradual change in living things over long periods of time.
27. Age Age compared with the ages of other rocks.
28. Film An extremely thin coating of carbon on rock.