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The world ocean is the most visible part of Earth from space. Three quarters of the planet Earth are covered by water. Most of the planet's solid surface is abyssal plain, at depths between 4,000 and 5,500 metres (13,100 and 18,000 ft) below the surface of the oceans.
It is the most abundant substance on the surface of Earth [22] and the only common substance to exist as a solid, liquid, and gas on Earth's surface. [23] It is also the third most abundant molecule in the universe (behind molecular hydrogen and carbon monoxide). [22] Water molecules form hydrogen bonds with each other and are strongly polar.
An ecosystem (or ecological system) is a system that environments and their organisms form through their interaction. [2]: 458 The biotic and abiotic components are linked together through nutrient cycles and energy flows.
In the Pali Canon a paragraph appears many times recording the Buddha describing how he began his quest for enlightenment, saying: [8] So, at a later time, while still young, a black-haired young man endowed with the blessings of youth in the first stage of life—and while my parents, unwilling, were crying with tears streaming down their faces—I shaved off my hair & beard, put on the ochre ...
Some experts prefer to classify this region as a subdivision of the Ashanti Uplands because of the many characteristics they share. [1] Unlike the uplands, the height of the Akan Lowlands is generally between sea level and 150 metres (490 ft). [1] Some ranges and hills rise to about 300 metres (980 ft), but few exceed 600 metres (2,000 ft). [1]
Geomorphology (from Ancient Greek: γῆ, gê, 'earth'; μορφή, morphḗ, 'form'; and λόγος, lógos, 'study') [2] is the scientific study of the origin and evolution of topographic and bathymetric features generated by physical, chemical or biological processes operating at or near Earth's surface.
The geography of Mexico describes the geographic features of Mexico, a country in the Americas. Mexico is located at about 23° N and 102° W [ 1 ] in the southern portion of North America . [ 2 ] [ 3 ] From its farthest land points, Mexico is a little over 3,200 km (2,000 mi) in length.
Visualization of the ice and snow covering Earth's northern and southern polar regions Northern Hemisphere permafrost (permanently frozen ground) in purple. The polar regions, also called the frigid zones or polar zones, of Earth are Earth's polar ice caps, the regions of the planet that surround its geographical poles (the North and South Poles), lying within the polar circles.