When the Sea Moved

Investigate the shape of the planet under the sea by moving the sea itself: the shelves around the continents, the land bridges between them, the gates that cut a sea off, the mountains and trenches of the deep floor, the land below sea level that stays dry, and what the ice on land would do. Taught on a live globe of the whole Earth built from measurements of the land and the sea floor. Eight investigations for ages 12 and up.
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Course cover

Land under the sea

Lesson 1
Two Thirds Hidden image

Two Thirds Hidden

More than two thirds of the planet lies out of sight, under the sea.
Start
Lesson 2
A Walk to America image

A Walk to America

Two continents face each other across a strait near the top of the world.
Start
Lesson 3
The Line Animals Didn't Cross image

The Line Animals Didn't Cross

Two islands within sight of each other have birds from two different worlds.
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Gates, ridges and trenches

Lesson 4
A Sea Becomes a Lake image

A Sea Becomes a Lake

A sea more than two kilometres deep is joined to the ocean through one narrow strait.
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Lesson 5
The Middle of the Ocean image

The Middle of the Ocean

The middle of the Atlantic hides something no one could see for centuries.
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Lesson 6
Deeper Than Everest image

Deeper Than Everest

Somewhere the sea floor goes down further than the highest mountain goes up.
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When the sea rises

Lesson 7
Below Sea Level, Still Dry image

Below Sea Level, Still Dry

The lowest dry land on Earth lies far below the level of the sea next door.
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Lesson 8
If the Ice Let Go image

If the Ice Let Go

The ice on land holds enough water to move every coastline in the world.
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Review and assessment

Lesson 9

Test: When the Sea Moved

Review the course ideas by applying them to new situations, with kind feedback after every answer.
Locked till you take the prior lesson