Transcript Chapter 28
Standard 1b. Students know the evidence from Earth and moon rocks indicates that the solar system was formed from a large nebular cloud of dust and gas about 4.6 billion years ago. Objective 1 List and describe the 4 surface features of the moon. Summarize the 3 stages by which the moon formed. Compare and Contrast the moons of other planets. Describe asteroids and comets. Compare meteoroids, meteorites, and meteors Chapter Test Objective 2 Objective 3 Objective 4 Objective 5 Assessment Create a flashcard for the following key terms…they begin on page 719. • Comet • Satellite • Oort cloud • Moon • Meteoroid • Galilean moon • Meteor • Asteroid •Any large body that orbits a planet is a SATELLITE. If it is a natural satellite, it is a MOON. • Lighter areas are HIGHLANDS (mountains/volcanoes) • Darker areas are MARIA (lava fields) • The surface of the moon is covered in bowl-shaped depressions called CRATERS – Most of the moon’s craters formed from ASTEROIDS colliding with the moon for 4 billion years – The moon is covered in craters because it has no atmosphere to protect it • The moon is covered in dust and rock from space debris called REGOLITH • Lunar rocks are very similar to Earth’s rocks. They are Igneous. Giant Impact Hypothesis • Mars-sized object collided with Earth 4 billion years ago. Chunks ejected from earth and orbited the Earth, clumping together to form the moon. Lunar Interior • The moon was originally covered in an ocean of molten rock. Over time it cooled and denser material sank to the center giving it layers. Meteorite Bombardment • Asteroids and debris left over from the formation of the solar system continually struck the moon forming craters. • Finish the bubble map… Earth’s Moon • Mars, Jupiter, Saturn, Uranus, Neptune, Pluto all have moons • The 4 largest moons of Jupiter are known as the GALILEAN MOONS –3 are bigger than the Earth’s moon –Io, Europa, Ganymede, Callisto –Ganymede is larger than Mercury • Tape the fill-in sheet into your notebook • Answer the questions as we watch the video • Working in groups, use the books and laptops to finish the Scavenger Hunt • 1 paper per group Fragments of rock that orbit the sun Looks like a star with a tail Small bits of rock More than 50,000 Made of ice, rock, and cosmic dust When a meteoroid enters the atmosphere it burns up, creating a bright light or ‘shooting star’ or METEOR Ceres = largest Asteroid Belt= Main area of most asteroid orbits between the inner and outer planets. Orbit the sun Tails form when sunlight melts the ice into gas Less than 1mm Meteorite= if a meteoroid does not burn up entirely and lands it is called a METEORITE • Dinosaur extinction caused by an asteroid • Can cause huge craters • Most comets originate here • A spherical cloud of dust and ice beyond Pluto • Surrounds our solar system 1. Create a Poster of one of the following: a) Earth’s Moon b) Other Moons (choose 1) c) Asteroids d) Comets e) Meteoroids 2. Include a drawing, definition, and interesting facts (at least 5) 3. Present to Class