1. AIM: How is the Earth Constantly changing? (PSKI#2)
5/3/13
DO NOW:
Answer questions #1-6 on p in your PS ILS Review Book.
HOMEWORK:
Study for you Preliminary ILS Exam #2 on Monday.
LE ILS Flash Cards Due-Monday 5/6

2. Identify the 4 spheres of the earth.
Atmosphere – gas layer
Hydrosphere – water layer
Lithosphere – rock layer
Biosphere – living things

3. What gases does the atmosphere consist of?
78% Nitrogen
21% Oxygen
1% Carbon dioxide
<1% Water vapor
What are the major layers of the atmosphere?
Troposphere
Stratosphere
Mesosphere
Thermosphere
Which layer of the atmosphere contains our weather?
How does altitude affect air pressure?
As altitude increases, the air pressure decreases.

4. What are the layers of the Earth from the center outward?
Core – solid rock
Outer core – liquid rock
Mantle – mostly liquid rock
Crust – upper region solid rock

5. ILS Question
What information did scientists study in order to develop this model?
recordings of earthquake waves
locations of recent volcanic activity
core samples from seafloor drillings
fossils found in rocks

6. ILS Question
In addition to oxygen, which gases make up the largest percentage of Earth’s atmosphere? (1) hydrogen, helium, and water vapor (2) hydrogen, methane, and ozone (3) carbon dioxide, water vapor, and nitrogen (4) carbon dioxide, methane, and helium
Oceans, glaciers, lakes, and rivers are part of Earth’s (1) atmosphere (2) hemisphere (3) hydrosphere (4) lithosphere

7. What are the properties of minerals?
Hardness – the resistance of a mineral to being scratched
Luster – shiny of dull
Reaction to acid – calcite reacts with HCl acid to produce bubbles and a gas (CO2)
What are all rocks made up of?
Minerals

8. How was a sedimentary rock formed?
Weathering & eroded sediments cemented together
How were Igneous rocks formed?
Cooled magma or lava
How does Metamorphic rocks form?
Pressure & heat applied to rock

9. How are rocks classified?
By how they are formed
What are the key words for sedimentary rocks?
Weathering
Erosion
Sediments
Cemented

10. What are the key words for Igneous rocks?
Magma
Lava
Melting
Solidification
What are the key words for Metamorphic rocks?
Heat
Pressure
Banding

11. What do fossils indicate?
Found only in sedimentary rocks
Used to study past climates & environments
Describe the law of superposition?
Oldest rock layers are on the bottom, youngest rock layers are on top

12. ILS Question
Rocks are classified as igneous, metamorphic, or sedimentary according to (1) their color (2) their shape (3) how they formed (4) the minerals they contain
The diagram below shows a rock sample and an identification key. This rock sample would best be classified as (1) volcanic (3) metamorphic (2) sedimentary (4) igneous

13. What is weathering?
Process that breaks down rocks & minerals
Give an example of physical weathering.
Frost action
Give an example of chemical weathering.
Acid rain
Rust

14. What is erosion?
Process by which rock or soil is worn away and moved to another place
Transport of sediments
What is the driving force behind erosion?
Gravity
What are the agents of erosion?
Moving water
Wind
Glaciers

15. What are the processes involved in the water cycle?
Evaporation
Condensation
Precipitation
Runoff

16. ILS Question
The diagrams below show a natural process that weathers rock. Which statement best explains why this process results in weathering? (1) Frozen water acts as a solute. (2) Water expands when it freezes. (3) The mass of water increases when it freezes. (4) Frozen water dissolves most types of rocks.

17. ILS Question
The diagram below shows the water cycle. Which letter represents the process of evaporation? (1) A (3) C (2) B (4) D
Weathering and erosion of Earth’s crust are primarily caused by (1) gravity (2) volcanic activity (3) evaporation (4) sedimentation