NASA Earth on Instagram: "Aerosols are tiny solid or liquid particles in our atmosphere like dust, sulfates from pollution or volcanoes, wildfire smoke, and more. NASA’s GEOS model shows how these particles can affect the air we breathe—even from far away. In this visualization of aerosol data from the GEOS model, different colors represent different aerosols. Sea salt is blue, dust is pink, smoke is orange, and sulfates from pollution and volcanoes are green. Data is shown for Aug. 1 to Sept. 1

Explaining The Universe on Instagram: "Follow (us) @ExplainingTheUniverse to learn something NEW every day 🧠💫 A dam is a barrier built across a river or stream to control the flow of water. By holding back water, dams create reservoirs that can be used for drinking water, irrigation, hydroelectric power generation, flood control, and recreation. There are several types—such as gravity dams (which rely on their weight to resist water pressure), arch dams (curved, transferring force into the val