Final Study Guide

1. Final Study Guide Make sure you listen to the answers 

2. 1. Define Organic and inorganic Organic: Made from living things Inorganic: Not made from living things

3. 2. What are the properties of minerals? • Naturally formed/occuring • Inorganic • Solid • Definite crystal structure • Definite chemical composition

4. 3. How are igneous rocks formed? Explain the differences between intrusive and extrusive? Heating and cooling Intrusive: inside, coarse grained slow cooling, large crystals, lava granite Exstruve: outside, fine grained, fast cooling, small crystals, magma, obsidian

5. Igneous Rocks Coarse-Grained Fine-Grained Granite Rhyolite Gabbro Basalt

6. 4. How and where are metamorphic rocks formed? Foliated vs. non-foliated Heat and Pressure. Found near plate boundaries Foliated: banded Nonfoliated: not banded

7. METAMORPHIC ROCKS Meta=change Morphic=form/shape

9. 5. How and where are sedimentary rocks formed. Formed by Lithification and WEDCC. • Weathering • Erosion • Deposition • Compaction • Cementation

10. a. Weathering– the breakdown of material at the Earth’s surface.g i. The weathered material is called SEDIMENT.

11. ii. Sediment size varies – mud, sand, gravel

12. b. Erosion– movement of sediment from on place to another by WIND, WATER, or ICE.

13. c. Deposition– dropping off the sediment in a new location.

14. Deposition of the Mississippi

15. Now it’s time to put them together! d. Compaction (Squeezing) e. Cementation (Gluing)

16. 5 continued 1. Clastic: made from sediment • Shale (clay) • Conglomerate (gravel) • Sandstone (sand 2. Organic: made from living things • Chalk • Limestone 3. Chemical: Chemical reaction • Rock salt (water evaporating)

17. i. Sand becomes sandstone

18. ii. Clay and mud become shale

19. iii. Gravel becomes conglomerate.

20. Organic sedimentary rock is formed from previously living things. i. Limestone – ocean life ii. Coal – plant life on land

21. Chemical sedimentary rock is formed from a chemical reaction such as water evaporating and leaving rocks behind.

22. 6. Explain the rock cycle No start and no finish Any rock can be made into another rock if it’s FORMED a certain way 

24. Paleontology

25. 7. Explain each law • Superposition: older rocks on the bottom and younger on top • Horizontality: Layers are horizontal if not disturbed • Uniformitariansm: The same processes that are happening now have been happening for a long time

26. Superposition • Younger rocks are on the top. • Older rocks are on the bottom. • Layers must be undisturbed

27. Uniformitarianism – the idea that the same geologic processes shaping the Earth today have been at work throughout Earth’s history

28. The principle of original horizontality means that layers of sediment are generally deposited in a horizontal position.

29. 8 Part 1 . Absolute • Older than 50,000 = Uranium lead Method • Younger than 50,000 = Carbon-14 Method

30. 8 Part 1 . Absolute • Most precise • Gives an actual age • Puts a number to the age. This is why we use it! Uses: • Radioactive decay • Carbon 14 or uranium lead • Half-life

34. 8 Part 2 . Relative • Sequence • Age COMPARED to other rocks • Older or younger • NO NUMBER • Uses: • Index fossils • Law of superposition • Law of original horizontality

37. 9. What does the fossil record tell us? • Geological changes such as dry areas that were once under water • Organisms have become more complex and how they have evolved • How the environment looked in the past • How rock layers in different areas match up • How environment/animals have changed • The age of certain layers of rocks

39. 10. Why are fossil records incomplete? Most organisms don’t become fossils

40. 11. How old is the Earth About 4.6 billion years old

41. 12. In what type of rock are most fossils found? Sedimentary