Salt, an essential element for all animal life, is abundant here on Earth, but it still requires extraction from stone deposits or salty waters. The process of mining that salt can produce beautiful landscapes, including deep, stable caverns, multicolored pools of water, and geometric carvings. Some of these locations have even become tourist destinations, serving as concert halls, museums, and health spas touting the benefits of halotherapy. Collected here are images of salt mines across the world, above and below ground.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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