SCI7 LESSON#1 4TH-Q

• Earth – the third planet from the sun
• So far, the only known planet to have the capability of supporting life.
• the planet is formed at about 4.5 billion years ago.
• The Earth is an oblate spheroid
• Models of the Earth

  Globe & World Map
• Globe a 3-dimensional spherical model of the Earth
• World Map - a 2-dimensional representation of the surface of the Earth
• Latitude (also known as parallels)
• Latitude imaginary lines that go across the map - Starts at 0o going up or down in 15o increments
• Longitude (also known as meridians)
• Longitude lines run from top to bottom
• Equator - the line that divides the map, separating the Northern Hemisphere and the southern Hemisphere. 0 o measure
• PRIME MERIDIAN - the line that bisects the globe in half, separating the east and west
• ; the longitudinal “starting line.”
• Agreed to be in Greenwich, London United Kingdom 0 o measure
• International Date Line - located halfway around the world from the prime meridian or about 180° east (or west) of Greenwich, London, UK - the reference point of time zones
• Tropics – latitudes that correspond to a specific region.
• Arctic circle – the topmost part of the globe where the North pole is located
• Antarctic Circle – the Bottommost part of the globe where the South Pole is located
• Tropic of Cancer – from 23.5 N to 66.5 N
• Tropic of Capricorn – from 23.5 S to 66.5 S
• Equator – from 23.5N to 23.5S
• Northern hemisphere - half of the Earth that is north of the equator.
• Southern hemisphere - half of the Earth that is south of the equator
• Eastern hemisphere - half of the Earth that is east of the prime meridian.
• Western hemisphere - half of the Earth lies west of the prime meridian
• How to find coordinates?

  Latitude is read first. Longitude is read second.