wunder beta🏔️ Glaciers and Ice Sheets
Glaciers are rivers of ice that carve whole valleys. Discover how they form, how they reshape the land, and how giant ice sheets make icebergs.
What you’ll learn
- Rivers of IceExplain what a glacier is and how it forms from snow, and that it slowly flows downhill.A glacier is a huge mass of ice that slowly flows downhill like a frozen river. It forms where snow piles up faster than it melts, and the weight of new snow presses the old snow beneath into solid ice. Once thick enough, the ice flows, moving slowly but with unstoppable force.
- How Glaciers Shape the LandDescribe how glaciers shape the land, carving U-shaped valleys, lakes, and fjords.As a glacier flows, it scrapes and grinds the ground like giant sandpaper, carving the land. It cuts wide U-shaped valleys, sharpens peaks, and gouges hollows that fill to become lakes. When a glacial valley meets the sea and floods, it forms a deep fjord.
- Giant Ice SheetsDescribe ice sheets, compare Antarctica and Greenland, and explain how icebergs form by calving.Ice sheets are the largest masses of ice on Earth, gigantic glaciers spreading over whole lands. The two today are in Antarctica, the largest, and Greenland, the second largest, both kilometres thick in places. Where they reach the sea, chunks break off in a process called calving, forming icebergs.
Questions this course answers
What is a glacier?
A glacier is a huge mass of ice that slowly flows downhill like a frozen river.
How does a glacier form?
Snow piles up and its weight presses the lower layers into solid glacier ice over many years.
What shape of valley does a glacier carve?
Because glaciers are wide, they carve broad valleys shaped like the letter U.
How do glaciers change the land as they move?
Glaciers scrape and grind the ground, carving valleys and hollows that can become lakes.
Which of Earth's two ice sheets is the larger?
The Antarctic ice sheet is by far the larger, holding most of Earth's ice.
What is calving?
Calving is when chunks of ice break off a glacier or ice sheet into the sea, making icebergs.
Grounded in trusted sources
- NASA
- USGS
- British Antarctic Survey
- National Geographic
Every Wunder lesson is built from real, reputable sources — never invented.
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