Light has a source and travels in a direction . Objects in the sky move in regular and predictable patterns . The number of stars that can be seen through telescopes is dramatically greater than can be seen by the unaided eye. Scientific progress is made by asking meaningful questions and conducting careful investigations . Electricity and magnetism are related effects that have many useful applications in everyday life.
Scientific progress is made by asking meaningful questions and conducting careful investigations.
Elements and their combinations account for all the varied types of matter in the world . Water on Earth moves between the oceans and land and through the processes of evaporation and condensation . Energy from the Sun heats Earth unevenly, causing air movements that result in changing weather patterns . The solar system consists of planets and other bodies that orbit the Sun in predictable paths . The solar system includes the planet Earth, the Moon, the Sun, eight other planets and their satellites, and smaller objects, such as asteroids and comets.