Geology Rocks! Mystery Cache

Fault or Fact?
Rock Your EarthCache Knowledge

1. An example of a sedimentary rock is granite.
2. Slate is formed when a volcano erupts, pouring lava down its slopes.
3. About a dozen minerals are important in rock building.
4. Andesitic volcanoes are very explosive.
5. From surface to center, the layers of Earth are: crust, core, mantle.
6. Basalt is high in ferromagnesian minerals.
7. The Earth is 4.5 billion years old.
8. Pillow lavas are so called because they are soft.
9. Soils developed on slopes tend to be very thick.
10. Basalt is to Gabbro as Granite is to Andesite.
11. Marble is formed from limestone.
12. Talc is one of the softest minerals.
13. The mineral most resistant to weathering is feldspar.
14. Granite that cools slowly is coarse grained.
15. Molten rock below the surface of the Earth is called lava.
16. Metamorphic rocks can form from melting rock.
17. Limestone is a type of detrital sedimentary rock.
18. The longer a rock fragment is transported, the more angular it becomes.
19. A distinctive feature of sand dunes is crossbedding.
20. Sandstone is formed when sand particles are compacted.
21. Limestone is formed under water from the shells and skeletons of marine animals.
22. Vegetation is never effective in stabilizing slopes.
23. The direction water flowed can be determined by graded bedding.
24. A sedimentary rock composted of large angular fragments is breccia.
25. Kilauea volcano in Hawaii is a cinder cone volcano.
26. Compaction can turn sedimentary rock into loose sediment.
27. The primary facilitator of weathering in a desert is water only at a slower rate.
28. Metamorphic minerals align parallel to pressure.
29. The Grand Canyon is 2 billion years old.
30. Index minerals tell you at what latitude metamorphic rocks formed.
31. Lavas that are high in silica are very viscous.
32. Porosity is the percentage of voids or openings in a material.
33. Magnesium is always found on its own in nature.
34. Placer gold deposits are always mined deep underground.
35. Oil often accumulates near the top of salt domes.
36. Plate tectonics can cause tsunami and earthquakes.
37. A transgressing sea is moving away from the land.
38. Geology is the study of all rocks in the universe.
39. Sorting describes the shape of sedimentary rocks.
40. The basic building block of a mineral is the atom.
41. Obsidian is never found near a volcano.
42. Cutting through a slope makes it more stable.
43. Igneous rocks are formed from the hot molten material within the Earth's crust.
44. Talus slopes are composed of rock that has fallen to the base of a slope.
45. In a sequence of rocks, the oldest is on the bottom and the youngest is on the top.
46. The Earth's crust is a uniform layer.
47. A trace fossil is the poorly preserved shell of an organism.
48. The lithosphere is the part of the Earth we live on.

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