Vocabulary #11

solar system: the Sun and the objects that are traveling around it

planet: any of the eight large bodies that travel around the Sun and shine by reflectionits light

gravity. the force of attraction, or pull, between, any object and any other objects around it

inertia: the tendency of a moving object to keep moving in a straight line

lithosphere: the hard. outer layer of Earth, about 100 kilometers thick

crust: the rocky surface that makes up the top of the lithosphere

resource: any material that helps support life on Earth

hydrosphere: Earth's water