Introduction About Natural Changes:
Solar system is Sun and everything that travels around it. Solar system is elliptical in shape. That means it is shaped like an egg. The Sun is in the center of the solar system. Solar system is always in motion. Eight known planets and their moons, along with comets, asteroids, and other space objects orbit the Sun.
Sun is just one of about 100 000 million stars that make up our Milky Way galaxy. The Milky Way is one of many such star systems, each of which is called a galaxy. The Universe consists of about 100 000 million galaxies, each containing their own stars, planets and clouds of gas and dust, out of which stars and planets are born. The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty.
The movement of the Earth in an almost perfect circle around the Sun takes 365.26 days. Together, these days produce our year on Earth.
The Solar System:
The Solar System consists of: The Sun, Eight planets, Five dwarf planets, Many moons orbiting the planets and dwarf planets, Thousands of small Solar ,System bodies and Interplanetary dust.
The Sun’s heat and light provide the energy for life to exist on Earth. The Sun is a giant ball of extremely hot hydrogen and helium gases, nearly 150 million kilometres away. It is gigantic compared to the Earth.
Although all the planets of our Solar System were formed at the same time and from the same cloud of gas and dust, there are great differences between them. The four inner terrestrial (Earth-like) planets are Mercury, Venus, Earth and Mars, and are mainly made of rock and metal.
Earth is the largest of the rocky (terrestrial = Earth-like) planets. The word “earth” is Old English and comes from German. As far as we know, the Earth is unique in the Solar System for two reasons: it has liquid water on its surface and it supports life. Earth is humanity’s home planet. Most of its surface (over 70%) is covered with oceans, with the rest featuring a wide variety of land forms, from mountains and valleys to plains and beaches. Earth has a thick atmosphere, which is mostly nitrogen (78%) and oxygen (21%), with other gases such as argon, carbon dioxide, and water present in small amounts. The region on and near the surface of Earth (both above and below ground) is filled with life.
Weather is the condition of the outside air each day. The basic patters of weather include: temperature, wind, precipitation, and sky conditions (sunny, cloudy, etc.). Temperature is the measurement of cold or hot. Weather changes occur during different seasons.
Using simple weather instruments can enrich one’s understanding of weather. A thermometer is used to measure temperature. Wind is observed using a wind vane. Wind is air that is moving. A rain gauge can help measure precipitation. Precipitation is water that falls from the clouds. (rain, freezing rain, snow, sleet, and hail).
There are weather events such as thunderstorms, tornadoes, and hurricanes. A thunderstorm is a combination of strong winds and heavy rain accompanied by thunder and lightning. A tornado is a violent wind that looks like a funnel-shaped cloud; its spinning winds touch the ground. Hurricanes are storms that have very strong winds.
The weather greatly influences crop cultivation: it determines the growth and yield of the crop. It also largely affects the development of diseases and plagues. The application of crop protection agents, however, must not be seen as separate from the weather.
Useful for CBSE, ICSE, NCERT & International Students
Grade : 4
Subject : Evs
Lesson :Earth and Natural phenomenons
Topic: NATURAL CHANGES
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