Read the scientific textOnline version Lea el texto científico y responde. by My Project 1 La Tierra Earth is the planet where we live.Earth is the third planet from the Sun. It is the mayor of the four terrestrial planets of our solar system, which means that it is a solid planet and not a gaseous one (the other three terrestrial planets are Mercury, Venus and Mars). The volume of the Earth is more than a million times smaller than the Sun.Like the other planets in the solar system, the Earth orbits the Sun, and the full return in approximately 365 days (this is the flame of a year). It also revolves around its own axis, giving a complete turn in 24 hours (this is called a day).The Earth has a natural satellite: the Moon.The Earth is home to millions of species of plants and animals, including humans. It is the only place in the universe in which the existence of life is known. Some detailed calculations that the Earth formed about 4500 million years ago.About 71% of the earth's surface is covered with salt water oceans. The other 29% is formed by rocky surfaces that form islands and continents. The average temperature on the planet's surface is 15 ° C.The Earth has a spherical shape, although it is not a perfect sphere, since it is slightly flattened at the poles (the polar diameter is 43 km less than the equatorial, that is, 1/297 less). In addition, its earth axis is inclined.The earth is not still. The video shows the rotation movement on its own axis. It is spinning very fast, but it really takes 24 hours to take a complete turn.The structure of the Earth is composed of layers. The most superficial is the bark. The second is the mantle, which is divided into the upper and lower mantle, and the last and deepest is the nucleus, which is divided into the upper and lower nucleus. 2 Los insectos Insects are a class of invertebrate animals that are characterized by a pair of antennae, three pairs of legs and two pairs of wings (which, however, can be reduced or missing). The science that studies errors is called entomology.Insects comprise the most diverse group of animals on Earth, with approximately 1 million described species, more than all other groups of animals together, and with estimates of up to 30 million undescribed species, potentially representing more than 90% of the life forms of the planet. .Insects can be found in almost every environment on the planet, although only a small number of species have adapted to life in the oceans.Terrestrial arthropods such as centipedes, millipedes, scorpions and spiders are often confused with insects because they have similar body structures, but they are easily differentiable since insects have three pairs of legs, while scorpions and spiders have four pairs and lack antennas, and centipedes and millipedes have many pairs of legs.
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