The name Earth is an English/German name which simply means the ground. It comes from the Old English words 'eor(th)e' and 'ertha'. In German it is 'erde'. The name Earth is at least 1000 years old.
Earth, evolution of. The Earth was formed at the same time as the rest of the solar system by the coming together of materials that were not incorporated into the sun. Life in the form of single-celled algae was present when the Earth was 3.5 billion years old.
Modern geochemical evidence suggests that water was delivered to Earth by impacts from icy planetesimals similar in composition to modern asteroids in the outer edges of the asteroid belt.
By dating the rocks in Earth's ever-changing crust, as well as the rocks in Earth's neighbors, such as the moon and visiting meteorites, scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years.
The answer is, we don't know. The name "Earth" is derived from both English and German words, 'eor(th)e/ertha' and 'erde', respectively, which mean ground. But, the handle's creator is unknown. One interesting fact about its name: Earth is the only planet that wasn't named after a Greek or Roman god or goddess.
Earth's rocky core formed first, with heavy elements colliding and binding together. Dense material sank to the center, while the lighter material created the crust. The planet's magnetic field probably formed around this time. Gravity captured some of the gases that made up the planet's early atmosphere.
But the constant movement of Earth's tectonic plates raises a question: Will there ever be another supercontinent like Pangea? The answer is yes. Pangea wasn't the first supercontinent to form during Earth's 4.5-billion-year geologic history, and it won't be the last.
The Dinosaurs' Changing World
The Earth had heavy vegetation near costs, lakes, and rivers, but desert in its interior. During the Jurassic Period, the continents gradually broke apart. The world was warm, moist, and full of green plants. During the Cretaceous Period, most of the continents had separated.Today, we know that the continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics. The continents are still moving today. Some of the most dynamic sites of tectonic activity are seafloor spreading zones and giant rift valleys.
Late in the Paleozoic Era, some 300 million years ago, when the Ancestral Rocky Mountains were being worn by weather to low hills, warm inland seas covered parts of Colorado. As the land rose and a Sahara-like desert of enormous proportions covered the continent, the interior seas retreated.
about 175 million years ago
IF you could visit Earth as it was 100 million years ago, you wouldn't recognize it. At that time our now-temperate planet was a hothouse world of dense jungle and Sahara-like desert overrun by dinosaurs. This period, the Cretaceous, has long fascinated scientist and layman alike.
about 175 million years ago
The surface was molten. As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today's atmosphere. After about half a billion years, Earth's surface cooled and solidified enough for water to collect on it.
The Earth's shape changes because the climate events like El Nino shift where the mass of water is stored: in oceans, continents and the atmosphere.
Some changes are due to slow processes, such as erosion and weathering, and some changes are due to rapid processes, such as landslides, volcanic eruptions, Tsunamis and earthquakes.
The earth has not always looked the way it looks today. In other words, the United States one billion years ago was in a totally different location than it is today!!
Earth's water is (almost) everywhere: above the Earth in the air and clouds, on the surface of the Earth in rivers, oceans, ice, plants, in living organisms, and inside the Earth in the top few miles of the ground.
Some changes are due to slow processes, such as erosion and weathering, and some changes are due to rapid processes, such as landslides, volcanic eruptions, Tsunamis and earthquakes.
The 4 spheres are: lithosphere (land), hydrosphere (water), atmosphere (air) and biosphere (living things). All the spheres interact with other spheres. River action erodes banks (lithosphere) and uproots plants (biosphere) on the riverbanks. Flooding rivers wash away soil.
Sunlight penetrates the atmosphere, heating up air, water, and land. The increased heat evaporates more water, melts glaciers and sea ice, creates more clouds, alters wind and water currents, increases the frequency and intensity of storms and changes the patterns of rainfall worldwide.
Most geologists believe that the key differentiation process in the Earth was melting of much of the inner rock material after the Earth formed. The source of the heat was radioactive minerals trapped in the Earth as it formed. Gradually those minerals released heat as radioactive atoms decayed.
The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientists calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years.
Human Modification of the Environment. For thousands of years, humans have modified the physical environment by clearing land for agriculture or damming streams to store and divert water. As we industrialized, we built factories and power plants.
A landscape includes the physical elements of geophysically defined landforms such as (ice-capped) mountains, hills, water bodies such as rivers, lakes, ponds and the sea, living elements of land cover including indigenous vegetation, human elements including different forms of land use, buildings, and structures, and
Landscape change is a dynamic process. Landscape modification changes the spatial configuration of native vegetation. The extent of modification influences the proportion of edges, size and shape of a fragment. With increasing clearing, the distance between patches increases and landscape connectivity decreases.
reduced soil fertility. soil erosion due to land clearance and grazing. contaminated soils due to pesticides or overuse of fertilisers. water pollution from run-off or animal wastes, leading to eutrophication.
List of different types of landscape. Desert, Plain, Taiga, Tundra, Wetland, Mountain, Mountain range, Cliff, Coast, Littoral zone, Glacier, Polar regions of Earth, Shrubland, Forest, Rainforest, Woodland, Jungle, Moors.
Humans have altered almost all the landscapes of the UK through farming. Different farming types are suited to different landscapes: for example, sheep farming in upland areas and arable farming in fertile lowland valleys. When trees are felled for timber, a section of the plantation may be cleared.
A landscape includes the physical elements of geophysically defined landforms such as (ice-capped) mountains, hills, water bodies such as rivers, lakes, ponds and the sea, living elements of land cover including indigenous vegetation, human elements including different forms of land use, buildings, and structures, and
Examples include battlefields and president's house properties. Ethnographic Landscape—a landscape containing a variety of natural and cultural resources that associated people define as heritage resources. Examples are contemporary settlements, religious sacred sites and massive geological structures.
A landscape whose use, construction, or physical layout reflects endemic traditions, customs, beliefs, or values; in which the expression of cultural values, social behavior, and individual actions over time is manifested in physical features and materials and their interrelationships, including patterns of spatial
