Deltas, Waterfalls, and Lakes

Deltas

Deltas, Greece

Inland Deltas

America’s Inland Delta

Waterfalls

Resistant Ledge• Niagara• Victoria Hanging Valley• Glacial: Yosemite • Non-glacial: Angel

Angel Falls, Venezuela

Yosemite Falls, California

Niagara Falls

Evolution of Niagara Falls

Evolution of Niagara Falls

Retreat of Niagara Falls

LakesLimited Lifetime Thousands

- Millions of Yr.How They Form:• Grabens

– Tahoe 1600' – Baikal 5600' – Tanganyika 4000'

• Scour– Great Lakes to 1300' – Great Slave L. 2000' – Lake Winnipeg

• Damming• Tectonic - Lake Kioga• Landslide - Spirit Lake • Lava Flow - Clear Lake,

California • Glaciers - Lake Agazziz • Delta - Lake Ponchartrain• Small Lakes• Volcanic Collapse - Crater

Lake • Sinkholes • Kettle Ponds

Delta Dam: Lake Ponchartrain, Louisiana

Volcanic Dam:

Clear Lake, California

Tectonic Dam: Lake Kioga, Uganda

How Lakes Die

• Eutrophication • Infilling - Only Way to Destroy Very Deep

Lakes • Drainage at Outlet • Climate Change