Everything About EARTH | Best Facts About Earth | Dr Binocs Show | Peekaboo Kidz

This paragraph delves into the fascinating process of Earth's formation, beginning approximately 15 billion years ago inside the cosmic egg. The big bang led to the creation of the universe, and around 4.5 billion years ago, the Earth was formed from the remnants of a dead star. The Earth initially had a tumultuous surface with lava seas and a poisonous atmosphere, but over time, it cooled down, allowing water to rise and form oceans. The planet eventually developed a thin crust, and volcanic activity led to the creation of the supercontinent Pangaea. The movement of tectonic plates caused Pangaea to break apart, forming the continents we recognize today. The paragraph also touches on Earth Day, emphasizing the importance of ecological awareness and the fight against pollution.

This section explores why Earth and other celestial bodies are round. It explains that the International Astronomical Union (IAU) defines a planet as a celestial body that orbits the sun, is spherical, and clears its orbit of other objects. The spherical shape is a result of gravity, which pulls equally from all directions, causing celestial bodies to form a three-dimensional circle. However, Earth is not a perfect sphere; it's an oblate spheroid due to its rotation, which causes a slight bulge at the equator. This phenomenon is common among all planets in our solar system, with Saturn being the most pronounced. The paragraph also discusses the criteria for a celestial body to be considered a planet and the importance of Earth's shape to its inhabitants.

This paragraph explains the concepts of Earth's rotation and revolution, and how they contribute to the cycle of day and night as well as the change of seasons. The Earth spins on its axis, creating day and night as different parts of the planet face towards or away from the sun. One full rotation takes 24 hours, which constitutes a day. In addition to rotating, the Earth also revolves around the sun in an orbit, completing one full orbit every 365.24 days, which defines a year. The tilt of Earth's axis, caused by a collision with a Mars-sized object in the past, results in varying amounts of solar energy reaching different parts of the Earth throughout the year, leading to the seasons. The tilt also means that the seasons in the northern and southern hemispheres are opposite.

This segment provides insights into the structure of Earth, focusing on its crust. The Earth's crust is composed of rocks, soil, and other materials on the surface, and it is significantly thicker on land than under the oceans, extending up to about 25 miles. The crust floats on the mantle, which makes up about 85% of Earth's total mass and is a solid, rocky substance approximately 1,800 miles thick. Below the mantle lies the outer core, consisting of molten iron and nickel, and extending to a depth of 3,000 miles. The inner core, another 900 miles deep, is believed to be a solid ball of iron and nickel. The crust constitutes less than 1% of Earth's volume, and the outer core is the hottest part of the planet, comparable to the surface of the sun.

This paragraph discusses the various landforms that make up the Earth's surface, such as mountains, hills, valleys, plateaus, and plains. These features are shaped by both external and internal processes. External processes like wind and water erosion, as well as deposition, contribute to the shaping of the Earth's surface. Internal processes involve plate tectonics and volcanic eruptions, driven by the heat in the Earth's core. Mountains are categorized into fold, block, and volcanic types, depending on their formation. Plains are extensive, flat areas that are ideal for human habitation and agriculture. Plateaus are elevated, flat landforms that rise sharply from the surrounding area and can be formed by tectonic movements or volcanic activity. The paragraph also mentions that landforms can exist underwater, such as submarine mountain ranges and basins.

This section focuses on deserts, which are dry, arid regions with little to no vegetation due to scarce rainfall. Deserts are characterized by high daytime temperatures and a lack of moisture. The process of fertile land turning into desert is known as desertification, with human activities being a significant cause. Activities such as overgrazing, deforestation, and poor agricultural practices contribute to desertification by removing vegetation that holds the soil together, allowing wind and water to erode the nutrient-rich topsoil. The paragraph also highlights the largest plateau in the world, the Tibetan Plateau, and the deepest landform on Earth, the Mariana Trench, located in the South Pacific Ocean.

This paragraph introduces the four major domains of Earth that support life: the lithosphere, hydrosphere, atmosphere, and biosphere. The lithosphere comprises the Earth's crust and the upper layer of the mantle, forming the solid part of the planet and区分为 continental and oceanic crust. The hydrosphere encompasses all water bodies on Earth, covering 71% of the surface, but only 2.5% of this water is consumable by humans. The atmosphere is a layer of gases surrounding the Earth, playing a crucial role in temperature regulation, oxygen provision, and weather patterns. It consists of the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The biosphere represents all regions of Earth where life exists, including the plant and animal kingdoms. The paragraph emphasizes the importance of cherishing and preserving these domains as they are essential for human survival and the only home we have.