As the subsidence continues, the fringing reef becomes a barrier reef, and ultimately an atoll reef. 1  Darwinâs theory starts with a volcanic island which becomes extinct. 2  As the island and ocean floor subside, coral growth builds a fringing reef, often including a shallow lagoon between the land and the main reef.
wikiHow to Bump a Lock. âBumpingâ is a lock-picking technique that refers to the repeated striking motion used to dislodge the pins inside a lock. Doing this requires a specially cut key, known as a bump key, that with the right application can be used to force open 90% of cylindrical locks.
Acquire a bump key. A bump key is a key that will fit the lock you want to bump, but which doesn't unlock it per se. As long as the key will fit in the lock, it can be turned into a bump key by filing every cut down to the lowest acceptable depth.. Bump open a tumbler lock. Bumping a lock is a quick, simple lock picking technique that is useful in the case of having to open a door that's been closed for a long time (for example, of an unused home on family property), or if you need to break into an elderly relative's house to make sure they're okay.