Published on January 24, 2008
The Terrestrial Planets: The Terrestrial Planets Slide2: The Earth The Earth’s atmosphere has evolved over billions of years: The Earth’s atmosphere has evolved over billions of years First atmosphere: _________ and _________ left over from the formation of the solar system Second atmosphere: ______________ released from Earth’s interior by volcanoes Current atmosphere: 78% _________ and 21% ________ which was created by biological activity. Earth’s Ozone Layer: Earth’s Ozone Layer Protects the surface from hazardous __________ radiation from the Sun Earth’s protective ozone layer had to form before early life could move from the oceans onto dry land Ozone is _____________ Can be destroyed by synthetic chlorofluorocarbons (CFCs) Slowly replenishes itself as it is created from sunlight and lightning Earth’s interior consists of a _____ _________ and an _________ rich core: Earth’s interior consists of a _____ _________ and an _________ rich core Slide6: Earth’s surface is composed of about nine major plates which slowly move relative to one another Plate tectonics is driven by ___________________ in Earth’s mantle: Plate tectonics is driven by _________ __________ in Earth’s mantle Slide8: Plate tectonics produced major changes to the Earth’s surface over the past 200 million years The Earth’s _________ _______shield us from the stream of charged particles from the Sun called the _______ _____: The Earth’s _________ _______shield us from the stream of charged particles from the Sun called the _______ _____ Slide10: Aurorae Slide11: The gravitational force between Earth and Moon results in tides Large _____________ occur when the Sun and Moon are aligned such that they BOTH pull on the Earth’s water. Smaller _____________ occur when the Sun and Moon are misaligned such that they pull on the Earth’s water in different directions. Slide12: Bouncing laser beams off the Moon demonstrates that it slowly ________ ________ from the Earth Slide13: Gravitational forces produce the tides and keep the same side of the Moon always facing the Earth The Moon’s surface is covered with _______, _______, _________: The Moon’s surface is covered with _______, _______, _________ Question: Question Why would it not be a good idea to open a restaurant on the moon? The Moon probably formed from debris cast into space when a huge ___________ struck the young Earth: The Moon probably formed from debris cast into space when a huge ___________ struck the young Earth Slide17: Mercury: The Messenger Slide18: Mercury’s temperature range is the most extreme in the solar system Mercury’s slow _________ day rotation and the lack of an appreciable atmosphere means temperatures vary enormously from one side of the planet to the other. Daytime with the Sun overhead reaches 800°F Midnight with the Sun completely obscured is -280°F Slide19: Venus: The Beauty Slide20: Venus: The Beauty The surface of Venus is completely hidden beneath permanent cloud cover that consists of 92% ___________ and ___________ acid! Slide21: The Temperature of Venus The ___________________ effect heats Venus’s surface Temperature is much higher than Mercury daytime AND nightime caused by the greenhouse effect Slide22: Venus’s Surface Venus is covered with gently rolling hills, two “continents,” and numerous ________________ Slide23: Mars: The Warrior Slide24: Mars’ two moons, _______ and ________, look more like _________ than spheres Slide26: Pathfinder Panorama (1999) Slide27: Intelligent Life on Mars? 1877, Giovanni Schiaparelli reported presence of “canali” on the surface “canali” = Italian world for _______ was translated to __________ Percival Lowell drew detailed maps of mars showing an elaborate system of canals built to bring water to arid regions Slide28: Life on Mars? Martian meteorite blasted from Mars _________ years ago and landed in Antarctica ____________ years ago Fossil? Slide29: Water on Mars? Slide30: Water on Mars? Human Exploration of Mars?: Human Exploration of Mars?