Multiple choice general knowledge science & technology

By 2100 AD, global temperature is expected to rise by about 2 °C and consequently, the sea level by about 50 cm from the present level. How is a rise in temperature expected to increase the level of the sea?

  1. By expanding ocean water

  2. By melting mountain glaciers

  3. By causing ice sheets of Antarctica and Greenland to melt and slide into the oceans

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All three mechanisms contribute to sea-level rise from warming: (1) thermal expansion as ocean water heats and occupies more volume; (2) melting mountain glaciers and ice caps adding freshwater; (3) melting and sliding of Greenland and Antarctic ice sheets into oceans. The combined effect is projected at ~50cm by 2100 for 2°C warming.

Keep practicing — related questions