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Explore the world's views on the topic of international trade. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

An introduction to the European colonization and settlement of North America, covering leaders, the Spanish conquest, Roanoke, Plymouth, Jamestown, and more. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

Did you know that the Southern Ocean has some of the deepest waters on Earth. Its deepest point is almost four times deeper than the Grand Canyon. Find out more in Southern Ocean.

Did you know that the Arctic Ocean is the world's smallest ocean? It is about 1.5 times as big as the United States. Find out more in Arctic Ocean.

Readers will learn about cirrus clouds.

Introduces readers to shadows and reflections. Its vibrant, hands-on examples help explain what shadows and reflection are, how they work, and how they can be used for communication.

Did you know that the Pacific Ocean is the world's largest ocean? It is so large that all seven continents could fit inside it. Find out more in Pacific Ocean.

Did you know that the Indian Ocean has several underwater volcanoes? Some even rise above the water. Find out more in Indian Ocean.

Readers will learn about how stratus clouds.

Readers will learn about cumulus clouds.