GEOG 101 1st Edition Lecture 3Outline of Last Lecture I. What Physical Geographers doII. Scientific ResearchIII. Earth SystemOutline of Current Lecture I. Feedback A. Positive/ NegativeB. Change in a System and Key TermsII. Electromagnetic RadiationIII. Forms of EnergyA. RadiantB. PotentialC. KineticD. HeatE. MechanicalCurrent LectureI. Feedback: When outputs come back into a system as inputs-Exogenous Input Change #1 Response Change #2 becomes an endogenous input A.i. Positive feedback increases the change. ii. Negative feedback maintains homeostasis by stopping or slowing the change. B. Key terms:-Thresh hold: the amount of change a system can deal with.-Resilience of a system: the amount of change a system can go through without reaching a thresh holdII. Electromagnetic Radiation is energy that comes from radioactive or irradiated objects. It is absorbed, scattered, reflected, and refracted in the Earth’s system. -Longwave Radiation is safer (radio, microwave, infrared)-Shortwave Radiation is dangerous (Ultraviolet, X-ray, Gamma ray)-Albedo is the measure of the amount of radiation reflected-not absorbed- by a surface. High albedo means much energy is reflected which means cooler conditions.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.-Remote Sensing: via satellites or airplanes; depends on the reflection of radiation from the surface to the sensor.III. Forms of EnergyA. Radiant: electromagnetic radiation B. Potential: energy stored in an object due to its position in a gravity field (or due to the arrangement of its parts)C. Kinetic: energy of motion. -Velocity: rate of travel, or speed. In Physical Geography, velocity is very important in determining how streams and winds can shape the landscape.D. Heat :a form of kinetic energy. Heat can be transferred, but not destroyed.i. Heat Radiation: infrared radiation is generated by heat energy. The Earth radiates energyii. Latent Heat: Heat stored in molecules. Hydrogen bonds in water storelatent heat.iii. Sensible Heat: heat measurable within a system- heat you can senseiv. Temperature: a measure of
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