S5 Effects of climate change — D level

Watch this video about ice in Antarctica

Questions

1. If all of the ice in Antarctica melted, how much higher would the sea level be?
2. What is a grounding line? Draw a diagram to explain it.
3. What happens when the grounding line reaches the tipping point?
4. If the grounding line reaches the tipping point, can the ice grow back again?
5. How much would the sea level rise if the grounding line crosses the tipping point in West Antarctica?
6. The video said that grounding lines are retreating in many places in Antarctica. Do we know if they have reached their tipping points?