Describes the physical characteristics, habitat, food habits, and attack/defense mechanisms of this shark species known for its dark, tiger-stripe markings.

Describes the variety of colors, various parts, growing conditions, and other aspects of one of the most popular flowers in the world.

Surveys the origin, geological borders, climate, water, plant and animal life, and economic and ecological aspects of the Pacific Ocean.

Surveys the origin, geological borders, climate, water, plant and animal life, and economic and ecological aspects of Lake Superior.

Surveys the origin, geological borders, water, plant and animal life, and economic and ecological aspects of the Mississippi River.