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- https://geo.libretexts.org/Bookshelves/Geology/Book%3A_An_Introduction_to_Geology_(Johnson_Affolter_Inkenbrandt_and_Mosher)/14%3A_Glaciers/14.06%3A_Ice_Age_GlaciationsA glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one durin...A glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one during the Archean-early Proterozoic (~2.5 billion years ago), another in late Proterozoic (~700 million years ago), another in the Pennsylvanian (323 to 300 million years ago), and the most recent Pliocene-Quaternary glaciation (Chapter 15).
- https://geo.libretexts.org/Courses/Fullerton_College/Introduction_to_Earth_Science_(Ikeda)/14%3A_Glaciers/14.05%3A_Ice_Age_GlaciationsA glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one durin...A glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one during the Archean-early Proterozoic (~2.5 billion years ago), another in late Proterozoic (~700 million years ago), another in the Pennsylvanian (323 to 300 million years ago), and the most recent Pliocene-Quaternary glaciation.
- https://geo.libretexts.org/Courses/Fullerton_College/Introduction_to_Geology/14%3A_Glaciers/14.05%3A_Ice_Age_GlaciationsA glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one durin...A glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one during the Archean-early Proterozoic (~2.5 billion years ago), another in late Proterozoic (~700 million years ago), another in the Pennsylvanian (323 to 300 million years ago), and the most recent Pliocene-Quaternary glaciation.
- https://geo.libretexts.org/Courses/California_State_University_Los_Angeles/Book%3A_An_Introduction_to_Geology_(Johnson_Affolter_Inkenbrandt_and_Mosher)/17%3A_Glaciers/17.06%3A_Ice_Age_GlaciationsA glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one durin...A glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one during the Archean-early Proterozoic (~2.5 billion years ago), another in late Proterozoic (~700 million years ago), another in the Pennsylvanian (323 to 300 million years ago), and the most recent Pliocene-Quaternary glaciation (Chapter 15).
- https://geo.libretexts.org/Courses/Coalinga_College/Introduction_to_Earth_Science_(C-ID%3A_GEOL_121)/03%3A_The_Hydrosphere/3.33%3A_Ice_Age_GlaciationsA glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one durin...A glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one during the Archean-early Proterozoic (~2.5 billion years ago), another in late Proterozoic (~700 million years ago), another in the Pennsylvanian (323 to 300 million years ago), and the most recent Pliocene-Quaternary glaciation (Chapter 15).
- https://geo.libretexts.org/Courses/Gettysburg_College/Book%3A_An_Introduction_to_Geology_(Johnson_Affolter_Inkenbrandt_and_Mosher)/10%3A_Glaciers/10.06%3A_Ice_Age_GlaciationsA glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one durin...A glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one during the Archean-early Proterozoic (~2.5 billion years ago), another in late Proterozoic (~700 million years ago), another in the Pennsylvanian (323 to 300 million years ago), and the most recent Pliocene-Quaternary glaciation (Chapter 15).
- https://geo.libretexts.org/Courses/Coastline_College/An_Introduction_To_Geology_-_Coastline_College/11%3A_Glaciers/11.05%3A_Ice_Age_GlaciationsA glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one durin...A glaciation (or ice age) occurs when the Earth’s climate is cold enough that large ice sheets grow on continents. There have been four major, well-documented glaciations in Earth’s history: one during the Archean-early Proterozoic (~2.5 billion years ago), another in late Proterozoic (~700 million years ago), another in the Pennsylvanian (323 to 300 million years ago), and the most recent Pliocene-Quaternary glaciation (2.5 million years ago to now).
