Kerid crater lake, South Iceland

Kerid is a volcanic crater lake located in the on the popular tourist route known as the Golden Circle in south Iceland. It is one of several crater lakes in the area. The caldera, like the other volcanic rock in the area, is composed of a red (rather than black) volcanic rock. The caldera itself is approximately 55 m deep, 170 m wide, and 270 m across. Kerid’s caldera is approximately 3,000 years old.

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The Namib desert, southern Africa.

The Namib desert is a coastal desert in southern Africa. It stretches for more than 2,000 kilometres along the Atlantic coasts of Angola, Namibia, and South Africa. Namib is also considered to be the oldest desert in the world. The desert geology consists of sand seas near the coast, while gravel plains and scattered mountain outcrops occur further inland. The sand dunes, some of which are 300 metres high and span 32 kilometres long. The Namib is almost completely uninhabited by humans except for several small settlements and indigenous pastoral groups. 

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The Great Basin Desert

The Great Basin Desert is the largest US desert and covers 190,000 square miles. It is bordered by the Sierra Nevada Range on the west and the Rocky Mountains on the east, the Columbia Plateau to the north and the Mojave and Sonoran deserts to the south. The Great Basin Desert is a cold desert caused by the rain shadow effect from the Sierra Nevada to the west.

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Patagonian desert

The Patagonian Desert is the largest desert in Argentina and is the 7th largest desert in the world by area. It covers 673,000 square kilometers. It is located primarily in Argentina with small parts in Chile and is bounded by the Andes, to its west, and the Atlantic Ocean to its east, in the region of Patagonia, southern Argentina.

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The Ganges River, India

The Ganges is a trans-boundary river of India and Bangladesh. It is about 2,525 km long river and is the second largest river on the Indian-subcontinent by discharge. It rises in the western Himalayas in the Indian state of Uttarakhand, and flows south and east through the Gangetic Plain of North India into Bangladesh, where it empties into the Bay of Bengal. The Ganges is the most sacred river to Hindus and is also a lifeline to millions of Indians who live along its course and depend on it for their daily needs. It is worshipped as the goddess Ganga in Hinduism. The Ganges was ranked among the five most polluted rivers of the world in 2007, with fecal coliform levels in the river near Varanasi more than one hundred times the official Indian government limits. Pollution threatens not only humans, but also more than 140 fish species, 90 amphibian species and the endangered Ganges river dolphin.

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Kilauea Volcano, Hawaii

Kilauea is shield volcano in the Hawaiian Islands, the most active of the five volcanoes that together form the island of Hawaii. It is located along the southern shore of the island. It is at 300,000 to 600,000 years old. 

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Popocatépetl Volcano, Puebla, Mexico

Popocatépetl is an active volcano located in the states of Puebla, Mexico. At 17,802 ft it is the second highest peak in Mexico, after the Pico de Orizaba at 18,491 ft.

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