1. Warm Up 9/17/08 A scientific hypothesis can become a theory if ____.
a. the entire scientific community accepts it
b. the hypothesis is tested extensively and competing hypotheses are eliminated
c. there are no other competing hypotheses
d. the hypothesis can be tested at least once
According to the nebular hypothesis, our solar system formed from a huge rotating cloud made mostly of ____.
a. carbon and hydrogen c. oxygen and helium
b. helium and hydrogen d. nitrogen and oxygen
What is the study of the atmosphere and the processes that produce weather and climate?
a. oceanography c. meteorology
b. geology d. astronomy
Answers: 1) b. 2) b. 3) c.

2. A View of Earth
Chapter 1, Section 2

3. Earth’s Major Spheres
Earth can be thought of as consisting of four major spheres: the hydrosphere, atmosphere, geosphere, and biosphere
Hydrosphere – the water portion of Earth
Atmosphere – the gaseous portion of a planet; the planet’s envelope of air
Geosphere – layer of Earth under both the atmosphere and the oceans
Because the geosphere is not uniform, it is divided into three main parts based on differences in composition—the core, the mantle, and the crust
Biosphere – all life on Earth; the parts of the solid Earth, hydrosphere, and atmosphere in which living organisms can be found

4. Earth’s Layered Structure

5. Concept Check What are Earth’s four major spheres?
The hydrosphere, atmosphere, geosphere, and biosphere

6. Plate Tectonics
There are two types of forces affecting Earth’s surface
Destructive forces such as weathering and erosion work to wear away high points and flatten out the surface
Constructive forces such as mountain building and volcanism build up the surface by raising land and depositing new material in the form of lava
The theory that finally emerged, called plate tectonics, provided geologists with a model to explain how earthquakes and volcanic eruptions occur and how continents move

7. Earth’s Major Plates

8. Concept Check
What is the difference between destructive forces and constructive forces?
Constructive forces build up the surface material, whereas destructive forces destroy surface material

9. Assignment Read Chapter 1, Section 2 (pg. 6-10)
Do Chapter 1 Assessment #1-36 (pg )
For Section 2: Do #’s 3, 9, 12, 13, 24-26, 34, 36

10. ASSIGNMENT: 6 Frames. 6 captions.
Create a COMIC POSTER: (15 pts)
Use page 4 of Text
6 Frames.
6 captions.
6 COLOR drawings that illustrate each phase of Nebular Hypothesis
DUE: TURN-IN End of Period.
2.5 pts = Captions
10 pts = Illustrations…use color!!!
2.5 pts = Effort