Planet Earth Structure

Before modern transportation and refrigeration, most of the food people ate was grown near their homes. Farmers planted and harvested crops by hand, using the same techniques that had been used for centuries. Growing food was backbreaking work. People got by with much less food and much less...

Lena River is one of the longest rivers in the world and the longest river to flow inside the Russian Federation. It measures about 4,400 kilometers in length. This river flows across the Far East regions of Russia,...

In the U.S., we can generally count on having safe, clean drinking water. We turn the faucet on and water appears. But in many parts of the world, families do not have a clean, safe water supply. They often walk miles to get water from streams or

Water is essential for life on earth. Without it, life as we know it would end. Our bodies are made mostly of water and need it every day to stay healthy.

Mount Hood is one of the most prominent of the cascade volcanoes. It is only 50 miles from the major Oregon city of Portland. With a height measured at 11,249 feet, it is the highest peak in Oregon. It is home to 12 different

Yenisei River is the largest river system flowing to the Arctic Ocean measuring 2,540 miles long. It measures 3,420 miles in length when combined with its major tributary the Angara. In terms of discharge, it is the sixth largest river in the world. The drainage basin of the river covers an area...

The Tigris River is one of two main rivers of ancient Mesopotamia. This river forms the border between Syria and

The Seine River is the second longest river flowing completely in France with a length of 483 miles. This river also serves as an important commercial waterway. The source of this river is a village named Source-Seine. This...

The Missouri River is the longest river in North America and the 15th longest in the world with a length of 2,341 miles. The drainage area of the river covers total 1,371,000 square kilometers. It flows through...

Mount Huangshan is located in Huangshan City, south of Anhui Province, China. It was designated an official World Heritage site by UNESCO in 1990. This mountain covers an area of 250 square kilometers with an area of 154 square...

The Orinoco River is one of South America's longest rivers with a length of 1330 miles. It originates from the Sierra Parima Mountains and flows through Venezuela and Columbia and eventually empties into the Atlantic...

Irtysh River is one of the longest rivers in Asia with a length of 2,640 miles. It begins at the junction point of the Biya and Katun rivers, in the Altai Mountains, and then flows through Siberia to the Gulf of Ob. The...

Zambezi River is the fourth longest river in Africa with a length of 2,200 miles. It is also the longest east flowing river in Africa. It originates in the wetlands of the Mwinilunga District of north-western Zambia. The first...