WA.4. Earth and Space Science
ES2. Earth Systems, Structures, and Processes
6-8.ES2. Cycles in Earth Systems: In prior grades students learned how Earth materials change and how they can be used for various purposes. In grades 6-8 students learn about planet Earth as an interacting system of solids, liquids, and gases. Solar energy powers the water cycle and drives the weather system and ocean currents. Energy from within the planet drives the rock cycle and moves huge plates on the Earth's surface, causing earthquakes and volcanoes. The landforms we see today result from processes that build up and break down Earth structures. These fundamental ideas will enable students to understand the history of their planet, Earth processes occurring today, and future geologic events.
6-8.ES2B. The Sun is the major source of energy for phenomena on Earth's surface, such as winds, ocean currents, and the water cycle.
6-8.ES2B.1. Students are expected to connect the uneven heating of Earth's surface by the Sun to global wind and ocean currents.
6-8.ES2D. Water is a solvent. As it passes through the water cycle, it dissolves minerals and gases and carries them to the oceans.
6-8.ES2D.1. Students are expected to distinguish between bodies of saltwater and fresh water and explain how saltwater became salty.