Lecture2

Lecture2 - GEOL 20 Lecture 2 8 Jan 2009 Taking Notes Fast Pace and Lots of Material Dont try and keep up during lecture with copious notes Web

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1/8/09 1 GEOL 20, Lecture 2 8 Jan 2009 Taking Notes • Fast Pace and Lots of Material • Don’t try and keep up during lecture with copious notes • Web access to Lecture Notes will be provided • Focus more on the general concepts when taking notes, and go back to these later and ±nd them in the Lecture Notes when studying. • Text book contains detailed descriptions as well. Computers in Class Lecture • OK to use for note taking • Not OK for these other things as they distract those around you • Tagging last night party photos on facebook • Web Sur±ng • Playing Games • Email Please - Turn Your Cell Phone OFF! Review Four primary energy sources fuel Earth processes: Impact of extraterrestrial bodies – Asteroids and comets; abundant in early Earth history, rare now Gravity – Mass of Earth pulls objects (glaciers, hillsides) downhill Earth’s internal heat – As Earth cools, heat flows from interior to surface – Volcanic eruptions, earthquakes – Plate tectonics; formation of continents, atmosphere and oceans The Sun – Evaporation of water into atmosphere produces weather – With gravity, powers agents of erosion
Background image of page 1

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

View Full DocumentRight Arrow Icon
1/8/09 2 Magnitude vs. Frequency • Large Catastrophic events are infrequent – Inverse relation between magnitude and frequency • Large Catastrophic events have larger recurrence intervals (time between events) – Direct relation between magnitude and recurrence interval. Population and Catastrophes • Catastrophes occur… • Where people are… • Underdeveloped countries … More fatalities, not as much ±nancial loss • Developed countries … Larger ±nancial loss, less fatalities More than 1 type of natural disaster operating in a highly populated under-developed region Source: Bilham, 1999 . Solar system began as rotating spherical cloud of gas, ice, dust and debris Gravitational attraction brought particles together into bigger and bigger particles Cloud contracted, rotation sped up and flattened into disk Formation of Sun – Greatest accumulation of matter (H and He) at center of disk – Temperature at center increased to 1 million degrees centigrade Nuclear fusion of hydrogen (H) and helium (He) began, producing solar radiation Solar System Web Animation Formation of planets Rings of concentrated matter formed within disk – Particles within rings continued to collide to form planets Inner planets (Mercury, Venus, Earth and Mars) lost much gas and liquid to solar radiation, becoming rocky (terrestrial) Outer planets retained gas and liquid, as gas planets Impact Origin of the Moon – Early impact of Mars-sized body with Earth – Impact generated massive cloud of dust (from Earth’s crust and mantle) and gas which condensed to form Moon – Lightweight gases and liquids lost to space – Lesser abundance of iron (from Earth’s core) in Moon Moon Formation Web Animation
Background image of page 2
1/8/09 3 Earth began as aggregating mass of particles and gases
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/07/2009 for the course GEOL 20 taught by Professor Steidl during the Winter '08 term at UCSB.

Page1 / 13

Lecture2 - GEOL 20 Lecture 2 8 Jan 2009 Taking Notes Fast Pace and Lots of Material Dont try and keep up during lecture with copious notes Web

This preview shows document pages 1 - 4. Sign up to view the full document.

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