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Week 2 Lesson 4

Earth's Systems

QuestionAnswer
Geocentric Earth Centered.
Heleocentric Sun Centered.
Comets astronomical object with long tail:. an astronomical object that is composed of a mass of ice and dust and has a long luminous tail produced by vaporization when its orbit passes close to the Sun. The tail points away from the sun.
Planets object in orbit round star: an astronomical object that orbits a star and does not shine with its own light, especially one of those orbiting the Sun in the solar system.
Asteroids rocky object orbiting Sun: an irregularly shaped rock that orbits the Sun, mostly occurring in a band asteroid belt between the orbits of Mars and Jupiter.
Kepler's Law Three laws, that describe the motions of planets in their orbits. -The orbit of each planet is in the shape of an ellipse (oval). -The closer the planet is to the sun, the faster it orbits -The farther the planet is away from the sun, the longer it
Eccentricity deviation: the deviation of the path of an orbiting body from a true circle.
Relative dating Age of rock layer is based on depth. allows scientists to determine the age of a rock by observing the order that they were formed. Geological age of rocks of fossils is determined by comparing its placement with that of fossils in other layers of rock.
Absolute dating Age of rocks determined by measuring the amount of radioactive isotopes that remain
Half-Life time taken to lose half of radioactivity: the time a radioactive substance takes to lose half its radioactivity through decay.
Gravitational Forces The force that attracts a body toward the any other physical body having mass.
Weight heaviness: the quality of heaviness in things, determined by their mass or quantity of matter as acted on by the force of gravity, that counteracts efforts to lift or move them.
Mass physical quantity: the property of an object that is a measure of its inertia, the amount of matter it contains, and its influence in a gravitational field.
Created by: jandre04
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