Tarball
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Tarball:
Imagine you leave a piece of chewing gum out in the open, and over time it hardens and loses its stickiness. Similarly, a tarball is like a piece of petroleum gum that has been floating in the ocean, gradually hardening as it interacts with the elements. Just as the gum becomes less sticky and more solid after exposure to air, a tarball becomes weathered and more solid after being exposed to the sun, water, and other environmental factors in the ocean.

Practice Version

Tarball: A blob of petroleum which has been weathered after floating in the ocean. Tarball. Tarballs are sticky, weathered clumps of oil that form in the ocean after a spill.