ASTR 1345 1st Edition Lecture 19 Outline of Last Lecture I. Origin of the Solar SystemA. Terrestrial Planets vs Gas PlanetsII. Layers of the AtmosphereA. TroposphereB. StratosphereC. MesosphereD. IonosphereOutline of Current Lecture I. Earth’s InteriorA. CoreB. Inner CoreC. MantleD. Crust II. Plate TectonicsA. Continental DrifB. Seafloor SpreadingIII. Moon’s SurfaceA. MareB. RillesC. TemperatureIV. TidesA. High TideB. Tidal ShifC. Spring TidesD. Neap TidesCurrent Lecturel.A. The Earth’s core is of iron and nickel surrounded by less dense mantle, and a thin outermost crust.B. The inner core is solid because of very high pressure while the outer core is liquid.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.C. The mantle consists largely of minerals rich in iron, calcium, and magnesium. It’s made of hot plastic-like rock that flows slowly to Earth’s surface. The mantle breaks the crust in a process known as rifing.D. The crust is Earth’s outermost layer, composed of relatively low-density rock.ll.Plate tectonics is the motion of large plates of Earth’s surface caused by convective motions in the underlying mantle.A. Continental drif is the gradual movement of continents over the surface of Earth due to plate tectonics.B. Seafloor spreading is when magma upwells along rifs in the ocean floor causing adjacent segments of Earth’s crust to separate.lll.The Moon’s surface is powdered rock built up over billions of years. Although it’s not moist it sticks together like wet sand.A. Mare covers 17% of the moon. It is the large, relatively crater free plain on the moon and was caused by magma from the Earth’s core.B. Rilles are winding cracks in the surface caused by the collapse of solidified lava tube.C. Night time surface temp. inside the coldest craters in the northern polar region have been measured as low as 26K. During the day temps. At the equator can reach 400K, which indicates that the moon has one of the most extreme thermal environments.lV.The water on the part of Earth’s surface closest to the Moon experiences stronger gravitational attraction to the moon than the body of Earth. A. Water is pulled away from the surface by the Moon which is high tide.B. The difference in water heights between high and low tide is known as tidal shif.C. Spring tides are the largest tidal shifs and occur when the Sun and Moon pull in the same direction. This occurs when all three are in a straight line.D. The smallest tides are neap tides and occur when the Sun and Moon pull in opposite
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