1(convulsion)a period of great social/political upheaval — una época de gran agitación social/política
- changing schools was a great upheaval for the children — el cambio de escuela fue muy perturbador para los niños
- all the upheaval of moving house — todo el trastorno que implica una mudanza
- it was a terrible emotional upheaval for her — fue muy traumático para ella
- The Boxing Day tsunami and the Sumatran earthquake on March 28, which registered 9 on the Richter scale, have made the world conscious of these massive upheavals of the Earth.
- The ancient earth was prepared through thousands of years of geologic upheaval.
- Formed by volcanic upheavals, the island sits atop 100-foot cliffs rising straight out of deep ocean.
- Since being exposed through the earth's upheavals on the top of a mountain in Antarctica, the rest of the fish's body had now unfortunately been eroded away.
- The geological upheavals that divided rivers and river basins provided opportunities for speciation when fish populations were isolated.
- Over eons these sediments became buried beneath layers of mud and ash caused by forest fires, more volcanic eruptions, rains and upheavals.