Earth's Internal Structure When a meteorite impacts a planet or moon, its energy of motion (called kinetic energy)is transformed into heat energy. As Earth grew larger and larger from continual impacts, its temperature increased. Radioactive decay of materials like uranium, thorium and potassium also added heat
Unit Four The Multicultural Society Reference Book: (New) Integrated Coursey as a collage Student's and Teaching's Book Teaching Method: Explanation Combination Objectives 1 grasp the main idea and structure of the text 2 practice their critical thinking ability
Unit One Fighting with the Forces of nature Texta the Icy Defender Reference Book:(New) Integrated Course 4 Student's and Teaching,'s Book Teaching Method: ESA(engage, study, activate 1 grasp the main idea and structure of the text