Geol lecture 1 - 1-11-08

Geol lecture 1 - 1-11-08 - 1/11/08 I. A. 1. 2. 3. 4. 5. 6....

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1/11/08 I. Chapter 1 A. Scientific method 1. Observation, Experimentation, Serendipity 2. Hypothesis – come up with an idea and a guess at outcome (tentative explanation) 3. Test – challenges 4. Theory – a hypothesis that has survived several repeated tests and challenges 5. Test – challenges again (never be proved – Newton’s theory of gravity vs. Einstein’s theory, describe light theories – wave, particle, etc.) 6. Scientific Model: a. Try and describe a wide range of scientific phenomenon b. Ex) predicting the weather B. The Earth’s Surface/ Shape 1. Flat Earth – 2. Earth’s surface a. Not perfect sphere – b. Reg.- 6378 km c. Real – 6356 km d. Avg. 6371 km C. Irregular surface 3. Lowest point- Marianas trench (Challenger deep) – above Australia ( -11030 m) 4. Highest point- Mt. Everest – (8848 m) 5. On US – Mt. Whitney – 14498 ft./4400 m) and Death Valley – ( -298 ft/ - 90 m) a. Below sea level – surrounded by mountains – so ocean can’t get there b. Highest and lowest point on US is 80 miles from each other 6. Dead Sea on border of Jordan (-1371 ft/ 417 m) below sea level – opn a fault – place that is that deep that is not filled wit hsea water D. The geologic Record 1. Unusual science a. Lab – b. Field – map, measure how tilted the rocks are, other measurements, remote sensing – Mt. Etna, Sicily (idea for how faults are moving), sampling (sand samples, etc.) POINT – story of the earth becomes more clear c. Uniformitarianism – geologic processes we see in action today have worked much the same way throughout geological time WHY ASSUMPTION NES.? – Ex.) rocks in Utah, lead them to believe in a lake enviro. 20 mill. Years ago, never know how a rock formed a hundred mill. Years ago – assume that a certain geological feature and same feature in an old rock was formed by the same process E. The Earth’s Internal Structure 1. Density – p = mass/volume 2. Limestone – 657 g/225 cm 3 = 2.92 3. Droite – 27 6 g/94 cm 3 = 2.94 4. Gabbro – 588 g/96 cm 3 = 3.0 5. Greenschist – 541 g/ 132 cm 3 = 4.1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
a. All higher than they should be 6. Mass of the Earth – T = 2/ (L/g) , g = L(2(3.14)/T) Lecture 2 1/14/08 I. Continued from last class A. Mass of earth: Universal law of gravitation – Fg = G (constant x mass of body we are interested in) ME m / R >2 Fg = mg GM E m/ R>2 = mg M E = gR>2/ G = (8.37m/s>2)(6371km)>2(1 km/1000m)/ 6.67 x 10 > -11 m>3/kg x s>2) =5.093 x 10>24 kg B. D = m/v C. Volume: Usp = 4/3 (3.14(r>3)) U=4(pi)(6371000m)>3 / 3 Earth density – 4.702 g/cm>3 – real density – 5.5 MAIN POINT – earth more dense than rocks – more things that we can’t see II. Internal structure A. Density – something more dense in the earth then we can touch
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

Geol lecture 1 - 1-11-08 - 1/11/08 I. A. 1. 2. 3. 4. 5. 6....

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online