Week 24 REVIEW

1. Rocks are classified as igneous, sedimentary, or metamorphic based mainly on their -

Formation , how they form

2.A car travels a total distance of 250 km in 5 hours. What is the average speed of the car?

250/5 = 50 km/hr

3.When a sedimentary rock changes shape under heat and pressure, but does not melt completely, it becomes which of the following types of rock

metamorphic

•?

4. Which characteristic would be the most useful in identifying a sample of hematite from among the minerals listed in the table? streak

5. What process breaks rocks down into sediments?

weathering

6. A scientist wishes to create a model of the rock cycle. She uses modeling clay to represent igneous rock. She then breaks the modeling clay into tiny pieces and presses these pieces together to represent sedimentary rock. How could she best represent metamorphic rock?

Apply heat and pressure. She would put it in the oven.

7. A mineral’s powder color is a physical property. Which test can be performed to determine this color for mineral identification?

streak

8. How is the hardness of a mineral tested?Use common objects that have a known

hardnessBy scratching it with a fingernail, penny, glass,

nail, etc

9.Which type of rock is formed from cooled and hardened magma or lava?

Igneous

10 Which type of rock forms from bits and pieces of rock that has been cemented together?

Sedimentary

11. Ben ran 420 meters in 70 seconds. What was his average speed? 420m/70 sec= 6m/s

12 How would students conduct an experiment to find out whether a short ramp or a long ramp would be the easier entrance for a person in a wheelchair?

Less force is needed to go up the long ramp.

13. The graph shows the speed of a car traveling East over a 12 second period on a flat surface.

In the first 6 seconds shown on the graph, the car is:

Increasing speed

14. pulleys, like the one shown below, are useful because they

Change the direction of pull

15. Why is the streak of a mineral more reliable than the mineral’s color?

Same color mineral could produce a different color powder when it streaks.

16. Christopher and Esperanza had tested some samples they gathered while doing field research, but had forgotten to label their results. The results showed that the sample they had tested contained the elements listed below in the percentages listed below. What should they label the sample?

Solid earth Crust• Element Percent• Oxygen 46%• Silicon 28%• Aluminum 8%• Iron 5%• Calcium 3%• Others 9%

17. This rock sample would be best identified asSedimentary -

18. Which physical property of calcite is being tested in the picture below?

Hardness

19. What process breaks rocks down into sediments?

Weathering

20. The Mohs hardness scale is used in scratch tests to compare the hardness of materials. For example, according to the scale, diamond is the hardest mineral, which means a diamond can scratch and make a groove on every other mineral. A mineral can only be scratched by a harder material, so if an unknown material can scratch topaz, we know that the unknown material is harder than topaz.

If your fingernail can scratch and make a groove on a material, that material must be no harder than –

2.5 (Gypsum)

21.

22. The ocean is made of what 2 primary elements?

(H)Hydrogen and (O)OxygenH2O, there is more hydrogen than oxygen

22. What element is most abundant in living matter?

C=Carbon