For Blocks we have terms and definitions in 4 topics. The topics are Marketing, Speed Skating, Swimming and Volcano.

Blocks (Marketing)

Census areas usually equivalent to city blocks.

Blocks (Speed Skating)

Barriers that mark the inner boundary of the track.

Blocks (Swimming)

The starting platforms located behind each lane. Blocks have a variety of designs and can be permanent or removable. They also incorporate a bar to allow swimmers to perform Backstroke starts.

Blocks (Volcano)

Tephra is the general term now used by volcanologists for airborne volcanic ejecta of any size. Historically, however, various terms have been used to describe ejecta of different sizes. ... Fragments larger than about 2.5 inches are called blocks if they were ejected in a solid state and volcanic bombs if ejected in semi-solid, or plastic, condition. (Tilling, Heliker, and Wright, 1987)
Fragments of lava or rock larger than 64 millimeters in size that are blasted into the air by volcanic explosions. (Miller, 1989)
See: Tephra.

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