Download Week 24 CCA Review Guide (KEY)

CCA wk 24 Exam – Study Guide – 6th Science 2015
Concepts being tested:
Igneous Rocks: Intrusive & Extrusive
Rock Cycle
Sedimentary Rocks
Elements on Earth
Metamorphic Rocks
Testing Properties of Minerals
Layers of the Earth
Density: calculations, reading Volume displacement, reading graduated cylinders & triple beam balance
Vocabulary to Know:
Density
Igneous Rock
Igneous Intrusive Rock
Igneous Extrusive Rock
Metamorphic Rock
Sedimentary Rock
Rock Cycle
Lithosphere
Asthenosphere
Inner Core
Outer Core
Convection Currents
Hardness
Streak
Luster
Answer these questions:
1. How are Igneous Rocks formed? Melt, Cool, Harden. Melt in the crust. Cool and harden into igneous
rock
2. How are Metamorphic Rocks formed? Changed Rock – Heat & Pressure. Pulled into the crust. Heat
from the magma makes it soft. Pressure from mountains above and crust around it squishes the rock. A
chemical change can also occur with this heat and pressure, changing it into another type of rock.
3. How are Sedimentary Rocks formed? Weathering & Erosion & Deposition and Compaction &
Cementation. Rock is pulled away by wind and water. Deposited in the ocean or stream beds. Other
layers are layered on top. Compaction of the layers and evaporation pushes the water up, cementing
the layers together.
4. What must happen before an igneous rock can form? Melting in the magma
5. What must happen before a sedimentary rock can form? Erosion into Sediments
6. What would a sedimentary rock look like? Layers of different rocks on top of each other. Layers of
‘sand’, chunks of other rocks. (draw a pic)
7. What is the difference between an Intrusive Igneous Rock and an Extrusive Igneous Rock? Intrusive
Igneous rock cools inside (Intrusive is IN) the earth: slowly so large grains of minerals can be seen.
Extrusive Igneous Rock cools outside (Extrusive Exits the E) the earth’s crust: quickly so you cannot see
the separate grains.
8. Draw interior of the Earth and label the layers.
1.
2.
3.
4.
5.
6.
7.
Lithosphere
Asthenosphere
Crust
Lower Mantle
Mantle
Outer Core
Inner Core
9. What makes up the Lithosphere? Crust and upper part of the upper mantle
10. Where do Convection Currents occur in the Earth? Why are they important? Asthenosphere.
Convection currents move the Lithospheric Plates as they move from hot to cool. The Lithospheric
Plates are what makes our planet’s surface the way it is.
11. What causes Earth’s magnetic field? Liquid Outer core (Fe and Ni) rubbing against the solid Inner core
creates a magnet.
12. What major elements make up much of Earth’s crust? O, Fe, Si, Al
13. What major elements make up the Earth’s atmosphere? N O
14. What major elements make up Earth’s oceans? H, O (Na, Cl)
15. What major elements make up Earth’s living organisms? C, H ,O
16. What is the most abundant element in the Ocean? H
In the Atmosphere? N
In Sand? Si
17. How do you test for the hardness of a mineral? Scratch test. Fingernail, penny, nail, glass. Use Moh’s
Hardness Scale
18. How do you test for the color of a mineral? Streak test. Rub it on an unglazed piece of porcelain.
19. Volume of graduated cylinder and find Density. Look at the review from CCA 21
20. Calculate Density. Look at the review from CCA 21.