John Derting on TikTok

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

EraGem on Instagram: "Opals from around the world  Which opal ring is your favorite? Opal is one of October’s birthstones, and is revered around the world for its beautiful colors and uniqueness. Each origin reveals a different appearance, making no two opals alike. Rings shown: Australian black opal: rd26498 Ethiopian opal: cna26388 Mexican fire opal: ab26212 #opal #october #octoberbirthstone"