The graph shows how much sea levels changed from about 1870 to 2018. Items with pluses (+) are factors that caused ice to melt and sea levels to increase globally, while minuses (−) are variables that caused sea levels to decrease. These items are displayed at the time they were affecting sea level.
Graph shows sea levels starting in 1900 and includes events that lead to increases and decreases in sea level. In 1900, sea level change is set to zero. In 1920, sea level rose 20 millimeters. In 1940, sea level rose to 50 millimeters. In 1960, sea level rose to 100 millimeters. In 1980, sea level rose to 125 millimeters. In 2000, sea level rose to 150. By 2020, sea-level rises 200 millimeters.
© 2021 NASA's Goddard Space Flight Center
Which factor led to an increase in sea levels between 1960 and 1980?
Freezing mountain glaciers
Freezing Antarctic ice sheets
Thermal expansion
Global dam projects
