Environment

Primary pollutants are produced directly from a source but secondary pollutants are produced by reactions between primary pollutants and other chemicals.

August 28, 2017 11:36

Alluvium refers to soil and sediments that have been subjected to erosion and reshaped and redeposited by water.

August 28, 2017 11:30

Scree, found at the base of hilltops, volcanoes, etc., is the collection of broken rock fragments derived from periodic rockfall from cliff faces.

August 28, 2017 11:29

Magma becomes lava when it comes out on the surface of the Earth through a volcanic vent.

August 28, 2017 11:25

The Appalachian Trail is the longest hiking-only footpath in the world. But how long is it really?

August 25, 2017 16:29

The oldest lake in the world is a title often held by the ancient lake of Lake Zaysan or the ancient lake of Lake Baikal.

August 25, 2017 16:09

The whale shark is the world's largest type of shark.

August 25, 2017 16:03

With global warming, growing population, increased desertification, and other global issues looming large, severe water shortage will soon become a reality.

August 25, 2017 15:11

Islands are grouped into various classes like oceanic islands, desert islands, tropical islands, etc.

August 25, 2017 15:10

The island of Greenland is the world's largest, but did you know about these other superlatives?

August 25, 2017 14:46

The imperial amazon parrot is the national bird of Dominica.

August 25, 2017 14:30

Egypt has a hot and arid climate and four natural regions based on the relief of the land.

August 25, 2017 11:48

Several processes like erosion, volcanic eruptions, earthquake-triggered landslides, etc., give rise to islands within lakes.

August 24, 2017 17:32

A salt flat, also called a salt pan, is a unique geological phenomenon.

August 24, 2017 17:16

Islands that appear and disappear at different times due to the tidal effects have often inspired sea monster stories popularized by sailors.

August 24, 2017 16:03

Caused by a chemical reaction, chemical weathering can happen to anything from rocks to buildings.

August 23, 2017 14:39

A paleolake is a lake that existed in the past when hydrological conditions were different.

August 23, 2017 08:26

Although the Bermuda Triangle is often regarded as the deadliest location for sailing ships, many other places around the world are prone to shipwrecks.

August 18, 2017 13:56

These beautiful waterfalls can be found across all continents, from coast to coast.

August 17, 2017 15:34

Ants are one of the most interesting organisms in the animal kingdom.

August 17, 2017 14:28