Some caves - usually small - are formed when blocks of rock have moved relative to each other, leaving a gap.

When he blasted, great blocks of planetary crust moved or were melted.

These long, thin blocks have broken off the shelf and are moving away toward the southwest.

The rest of the profile comprises blocks that can be turned on, moved up and down, or removed.

If three gliders are shot in just the right way, the block will move farther away.

But the blocks were moving more quickly now, as if getting warmed up.

A wooden block will move at a lower force on ice than it would on concrete.

He hadn't seen or heard the blocks move, and yet he could not deny the opening before him.

The blocks moved, turned, and spelled out the word "cat."

Any structure built directly on top of the fault will be torn in two when the blocks move.