An earthquake begins when stress on large blocks of rock becomes greater than the strength of the rock.
(An earthquake; begins; T:when stress on large blocks of rock becomes greater than the strength of the rock) (stress on large blocks of rock; becomes; greater than the strength of the rock)
An earthquake stress on large blocks of rock
begins becomes
T:when stress on large blocks of rock becomes greater than the strength of the rock
greater than the strength of the rock