When was the last eruption of Mount St. Helens?
2008
1980
1980
1980
1980
1980
1980
1980
1893
1980
1905
1980
1893
1980
1905
1893
1979
1883
1980
1905
1902
1908
1979
1990
1893
1980
1970
1890
1979
1883
1990
1905
1902
1908
1980
1880
1893
1970
1979
1990
1890
1980
1883
1905
1912
1902
1880
1700
1970
1893
1979
1990
1908
1700 BC
1980
1890
1883
1970
1905
1912
1902
1979
1880
1700
1989
1990
1893
1980
1981
1908
1889
1970
1907
1890
1979
1883
1978
1989
1985
1990
1905
1902
1700 BC
1855
1980
1880
1700
1981
1893
1991
1970
1986
1912
1908
1889
1979
1978
1989
1985
1990
1907
1890
1980
1883
1981
1982
1905
1902
1855
1880
1991
1700
1970
1986
1893
1960
1989
1990
1912
1908
1889
1980
1895
1896
1907
1890
1883
1903
1904
1905
1879
1902
1855
1700 AD
1880
1700
2021
1893
1915
1912
1908
1907
1903
1904
1905
1902
1889
1700
1895
1891
2021
1896
1890
1893
1888
1915
1912
1908
1880
1907
1897
1883
1903
1904
1872
1905
1879
1902
1855
1889
1886
1895
2021
1890
1915
1860
1903
1904
1891
2021
1896
1915
1860
1893
1888
1897
1880
1860
1880 AD
1980s
1883
1872
1879
1855
1889
1886
1895
1890
2100
1891
1896