THE BEAUTIFUL EARTH [PAGE 2 of 3 CONTINUED]

Atmosphere according to scientists is a mixture of gases surrounding any celestial object that has a gravitational field strong enough to prevent the gases from escaping especially the gaseous envelope of Earth. The principal constituents of the atmosphere of Earth are nitrogen (78 percent) and oxygen (21 percent). The atmospheric gases in the remaining 1 percent are argon (0.9 percent), carbon dioxide (0.03 percent), varying amounts of water vapor, and trace amounts of hydrogen, ozone, methane, carbon monoxide, helium, neon, krypton, and xenon.

Earth has lots of Natural Beauty

Rivers is fresh water flowing from an upland source to a large lake or to the sea, fed by such sources as springs and tributary streams. The main parts of a river include a channel, in which the water flows.

Falls is a part of river. Water is falling from the top through mountains.

Lakes are a large, inland body of fresh or salty standing water. Lakes are distinguished from bodies of water such as bays and gulfs, and some seas that have an interchange with the ocean and are subject to tides

Mountains are distinguishable from plateaus by mountains’ usually limited summit area (mountains are generally much narrower at the top than at the base) and they are distinguishable from hills by mountains’ generally higher elevation. The elevation, or altitude, of a mountain is given as the height of the summit above sea level. Therefore, a mountain with an elevation of 4000 m (13,100 ft) may rise to a level of only 3000 m (9840 ft) above the surrounding land.

Greenery consist of Trees, plants,

Flowers are lots of different kind. They grow on land. Human uses flowers for decorations.

Other Living Entities on Earth

Animals: Scientists define animals as multicellular organism that obtains energy by eating food. With over 2 million known species, and much more awaiting identification, animals are the most diverse forms of life on earth. They range in size from 30-m (100-ft) long whales to microscopic organisms only 0.05 mm (0.002 in) long. They live in a vast range of habitats, from deserts and Arctic tundra to the deep-sea floor. Animals are the only living things that have evolved nervous systems and sense organs that monitor their surroundings. They are also the only forms of life that show flexible patterns of behavior that can be shaped by past experience.


Birds: Scientists define birds as animal with feathers and wings. Birds are the only animals with feathers, although some other animals, such as insects and bats, also have wings. Nearly all birds can fly, and even flightless birds, such as ostriches and penguins, evolved from flying ancestors.

Birds are members of a group of animals called vertebrates, which possess a spinal column or backbone. Other vertebrates are fish, amphibians, reptiles, and mammals. Many characteristics and behaviors of birds are distinct from all other animals, but there are some similarities. Like mammals, birds have four-chambered hearts and are warm-blooded—having a relatively constant body temperature that enables them to live in a wide variety of environments. Like reptiles, birds develop from embryos in eggs outside of the mother’s body.


Fish: Scientists define fish as diverse group of animals that live and breathe in water. All fishes are vertebrates (animals with backbones) with gills for breathing. Most fish have fins for swimming, scales for protection, and a streamlined body for moving easily through the water.

Fishes live in nearly every underwater habitat, from near-freezing Arctic waters to hot desert springs, from mud in dried-up tropical ponds to the deepest ocean abyss. Special antifreeze chemicals in the blood of Antarctic ice fish enable them to survive in water below 0° C (32° F).

 


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