Earth Systems
7th Grade Science · 14 lessons
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Lessons
- 1The Carbon CycleThe carbon cycle describes how carbon moves through atmosphere, biosphere, oceans, and rocks. Human activities like burning fossil fuels add extra carbon to the atmosphere.Experiment
- 2Earth's Inner LayersEarth has three main layers: the thin outer crust, the thick mantle, and the dense core. The core has a liquid outer layer and a solid inner layer made mostly of iron.Lesson
- 3Moving Tectonic PlatesTectonic plates are huge slabs of Earth's crust that float on the mantle. Where plates meet, earthquakes, volcanoes, and mountain building occur.Lesson
- 4Ocean Currents and ClimateOcean currents distribute heat around the planet, affecting climate worldwide. Warm currents flow from the equator toward the poles, and cold currents flow from the poles toward the equator.Experiment
- 5Layers of the AtmosphereThe atmosphere has several layers. The troposphere (closest to Earth) contains our weather. The stratosphere contains the ozone layer that protects us from harmful ultraviolet radiation.Experiment
- 6Understanding Climate ChangeClimate change refers to long-term shifts in temperature and weather patterns. Human activities, especially burning fossil fuels, have increased greenhouse gases and accelerated warming.Experiment
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