Origin of Earth s Water When Earth first formed it was so hot that the original water would be lost to space Water added later by comets and/or
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1 Origin of Earth s Water When Earth first formed it was so hot that the original water would be lost to space Water added later by comets and/or asteroids?? Some water (H 2 +O) formed in Protoplanetary disk, some water formed/originated in solar nebula
2 Internal Heat Heated mainly by impacts & radioactivity Protons determine element; Neutrons determine isotope. Unstable isotopes, decay into other elements with a certain half-life, producing heat Oldest rocks ~4.6billion yrs: Earth, Moon, Mars, Meteorites Heat depends volume-r 3 but radiated by surface-r 2 Small moons cool more quickly than big planets
3 Differentiation Crust of Earth less dense rock Mantle is plastic; 45%radius More dense iron sinks to core
4 Seismic Waves P-waves=Pressure speed 5km/sec S-waves=shear travel at 3km/sec Seismometer recording of Mexico earthquake Last earthquake felt in Victoria 11am 28Feb01 Time waves; find distance
5 Earth s Core Outer core: liquid Iron-shear waves not transmitted Inner core dense solid Iron
6 Plate Tectonics Crust and upper mantle form rigid lithosphere Broken into plates, which move about as fast as your finger nails grow Due to convection in Mantle
7 Plate Motions Convection in mantle causes midocean ridge = rift zones Youngest basalt rock near ridge compared to surrounding older rock shows magnetic reversals ~million year timescale Subduction Zones form stratovolcanoes = composite volcanoes
8 Magnetic Field Generated in Earth s Core Dynamo theory requires 1. Rotation of planet 2. Electrical conducting material 3. Convection/motion in core
9 Magnetosphere / Van Allen Belts Solar wind stopped at bow shock=magnetopause Protons trapped in lower belt; electrons higher belt Spiraling along magnetic field lines Apollo astronauts & IC s shielded from radiation
10 Aurora Borealis Caused by Solar Wind Guided by Earth s magnetic field Exciting air molecules Aurora=Northern lights from ISS Alaskan Aurora movie by A. Clay
11 Tides Moon s gravity causes tides Bay of Fundy has largest tides Victoria is the red dot We rotate into the high tidal bulge & then into the low tide area
12 Tidal Bulges All massive bodies exert gravitational forces Closer => stronger force Tides Forces result from unequal force on the near & far sides = differential gravitational force
13 Spring/Neap Tides Sun s tide is about half the moon s tide And can add= Spring or subtract=neaptide Depending on moon s phase Full 3 rd Quarter
14 Perigee & Apogee When the moon is closer to Earth, tidal force is stronger Higher high tides Lower low tides
15 Tides for Victoria Nominally two high & low tides_per day Coastline makes a big difference Bay of Fundy resonates ~13hrs Full Moon 3 rd ¼ Moon
16 Synchronous Lunar Rotation Earth raises tides on Moon with 20 times larger force Due to these tides Moon s rotation became locked to its orbital revolution Other moons & planets too
17 Tidal Bulge Pulls on Moon Tidal bulge accelerates moon which recedes 3.5 cm/year
18 Moon Pulls on Tidal Bulge so Earth s Rotation Slows From study of coral growth rings 600 Million years ago the year was 425 days long Each day is seconds longer than it was a century ago Last leap second was added at end of June Next 30Jun2015
19 Synchronous Earth Rotation In 10 Billion years Earth will rotate with one side always facing the moon 47 day month Like Pluto and Charon
20 During a Spring tide: a. The moon will be full or new phase b. The moon will be first or third quarter c. The sun will be near the vernal equinox d. The moon will be near apogee e. The sun will be near aphelion
21 To generate its magnetic field the Earth requires: a) Rapid rotation of the planet b) Electrically conducting core c) Convection of the core d) All of the above e) None of these the Earth s magnetic field is caused by a giant permanent magnet inside the Earth
22 Earth s Atmosphere Troposphere =lowest level = weather=convection Half atmosphere below 5km Stratosphere=ozone layer then Ionosphere
23 Ozone Layers Once enough O 2 in atmosphere ~2Billion years ago Ultraviolet light from Sun will form O 3 =ozone Which protects life on land from UV Ozone in stratosphere destroyed by CFC s from refrigerators etc. Leading to skin cancer etc.
24 Greenhouse Effect CO 2, Methane, Water all absorb infrared light so all are greenhouse gasses Earth is warmed by 30C More billions years ago when sun was young/fainter
25 Atmospheric Changes Primary Atmosphere might have been H2, He, CH4, NH3, H2O Secondary atmosphere outgassed probably H2O, CH4, CO2, N2 Now 20% O2 from photosynthesis by plants & after oxidizing iron
26 A Tsunami has nothing to do with a Tidal (Wave)
27 Comparative Planetology Earth is the standard for Terrestrial planets
28 Carbon Dioxide Cycle CO 2 dissolves in water Forms Carbonate rocks Which are subducted Volcanoes reemit CO 2 =Outgassing
29 Albedo=Whiteness More clouds = higher albedo and more cooling More Snow = higher albedo and more cooling Global temperature is critically dependent on albedo
30 CO 2 from burning fossil fuels causes global warming, But Global Warming
31 Snowball Earth 600 Million years ago continents at equator cooling Earth Ice formed to 30º latitude; Earth cools more Glaciers cover to the equator; cooling even more Volcanoes emit CO 2 increasing greenhouse effect; eventually warming
32 On to the Solar System
33 Origin of Biosphere Oldest fossils=stromatolites 3.5 Billion years ago Aquatic colonies of cyanobacteria Life started ASAP!
34 Early History of Earth Rocks from the Acasta River cliffs near Great Slave Lake dated to 4 billion years ago; so magma ocean frozen then Stages of planetary development: Differentiation, Impact Cratering, Flooding/Volcanism and Erosion
35 Ancient Human Modification of Climate CH 4 Solar Radiation A is the Solar radiation in the Northern hemisphere & Atmospheric Methane vrs age B is a blow up of the last 10,000 years Previous to 5,000 years ago methane was produced in swamps in Siberia But now it is produced in rice paddies Counteracting natural ice age trend? Solar Radiation CH 4 observed Natural trend CH 4
36 Carbon Cycle CO 2 dissolves in water Forms carbonate rocks Which are subducted Volcanoes remit CO 2
37 Earth s Three Energy Sources 1. Solar energy powers atmosphere & ocean motions 2. Tides of sun & moon help power ocean 3. Internal heat powers geological processes
38 Internal Heat Heated mainly by impacts & radioactivity Heat depends volume R 3 but radiated by surface R 2 All terrestrial planets have: 1. Core: Metallic: iron, nickel, iridium 2. Mantle: Iron rich, rocky 3. Crust: low density silicates
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