Europe is a continent that lies fully in the Northern Hemisphere and primarily in the Eastern Hemisphere. It consists of the westernmost peninsulas of Eurasia’s continental landmass, shares the continental landmass of Afro-Eurasia with both Asia and Africa, and is bounded by the Arctic Ocean to the north, the Atlantic Ocean to the west, the […]
The Atlantic Ocean is the second-largest of the world’s oceans, with an area of about 106,460,000 km2 (41,100,000 sq mi). It covers approximately 20 percent of Earth’s surface and about 29 percent of its water surface area. It is known to separate the “Old World” of Europe and Asia from the “New World” of the Americas in the European perception of the World.
Earth is the third planet from the Sun and the only known celestial object capable of harboring and supporting life. Land, which consists of continents and islands, covers 29.2 percent of the Earth’s surface. The remaining 70.8 percent is covered by water, largely in the form of oceans, seas, gulfs, and other salt-water bodies, but also
An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environments and are an example of an ecotone. Estuaries are subject both to marine influences such as tides, waves, and the influx of saline
The ocean (also the sea or the world ocean) is the body of salt water that covers approximately 70.8% of the surface of Earth and contains 97% of Earth’s water. Another definition is “any of the large bodies of water into which the great ocean is divided”. Separate names are used to identify five different areas of the ocean: Pacific (the largest) Atlantic, Indian, Southern (Antarctic), and Arctic (the smallest). Seawater covers approximately 361,000,000 km2 (139,000,000 sq mi) of the
Fallingwater is a house designed by the architect Frank Lloyd Wright in 1939 in the Laurel Highlands of southwest Pennsylvania, about 70 miles (110 km) southeast of Pittsburgh. The house was built partly over a waterfall on Bear Run in the Mill Run section of Stewart Township, Fayette County, Pennsylvania, located in the Laurel Highlands of the Allegheny Mountains. The house was designed as a weekend home for Liliane
The Po is the longest river in Italy. It is a river that flows eastward across northern Italy starting from the Cottian Alps. The Po flows either 652 km (405 mi) or 682 km (424 mi) – considering the length of the Maira, a right bank tributary. The headwaters of the Po are a spring seeping from a stony hillside at Pian del Re,
Cloud condensation nuclei (CCNs), also known as cloud seeds, are small particles typically 0.2 µm, or 1/100 the size of a cloud droplet on which water vapor condenses. Water requires a non-gaseous surface to make the transition from a vapor to a liquid; this process is called condensation. In the atmosphere of Earth, this surface presents itself as tiny solid or liquid particles called CCNs. When no CCNs are present, water vapor can be supercooled at
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Water is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth‘s hydrosphere and the fluids of all known living organisms. “Water” is the name of the liquid state of H2O at standard conditions for temperature and pressure. It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula H2O, indicates that
Land is the solid surface of Earth that is not permanently submerged in water. Most but not all land is situated at elevations above sea level (variable over geologic time frames) and consists mainly of crustal components such as rock, sand, soil, and sometimes ice. The vast majority of human activity throughout history has occurred in land areas that support agriculture, habitat, and various natural resources. Some life forms, including terrestrial plants and terrestrial animals,