They are the product of collisions and massive collapses.
On May 18, with little warning, a second earthquake, of magnitude 5.1, triggered a massive collapse of the north face of the mountain.
During the final 1975 offensive, it was not simply a case of a massive collapse.
The accident this time was a massive collapse - an event known to the community as a "bump" for the jolt it sent through the ground.
However, India lost their last 9 wickets for 29 runs in a massive collapse, slumping to 296 all out.
Complex regulatory regimes, on the other hand, are vulnerable to massive, expensive collapse if one element of the elaborate balance changes.
The platform seemed to quiver in anticipation of its massive collapse.
Then the massive collapse, running like a long scar through the mountainous wing of the continent Aquila.
Nevertheless, it was too late to stop the Tengu of Destruction from triggering a massive, worldwide collapse.
We cannot afford to have these massive collapses in confidence in our food.