Social Unit1 Planet Earth 4th Grade
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The document discusses imaginary lines on maps used to describe locations on Earth's surface, such as meridians and parallels. It also describes the two movements of the Earth: its revolution around the sun, which takes 365 days and 6 hours, and its rotation on its axis, which takes 24 hours. Finally, it mentions that astronomers and astronauts make discoveries by studying objects in space and going into space themselves.
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Stars
It is a slide showing the general information as well as some interesting information about stars that a student needs for his school.
Earth's Rotation
The document discusses several key facts about Earth's rotation:
- Earth spins on an imaginary axis, completing one rotation every 24 hours at a speed of over 1,000 mph.
- Earth's rotation causes day and night and influences the number and placement of time zones around the world.
- Earth bulges slightly at the equator due to the centrifugal force of its rotation.
- Earth's tilted axis and yearly orbit around the sun influence the seasons and amount of sunlight different areas receive through the year.
Earth's rotation powerpoint
The document discusses the Earth, moon, and sun. It provides facts about each including that the Earth revolves around the sun every 365 days, rotates on its axis every 24 hours causing day and night, and the moon revolves around the Earth every 29 days. It also notes that the sun is the largest object in the solar system and discusses phases of the moon.
Solar system formation[1]
The document summarizes the Nebular Theory of solar system formation. It states that the solar system formed from a rotating cloud of gas and dust remnants from a supernova. As the cloud collapsed under gravity, it flattened into a disc and spun faster. The center became very hot and formed the Sun, while the planets formed from accretion of planetesimals in the disc. The terrestrial planets are rocky, while the gas giants formed from condensation of ices and gases in the outer solar system. However, some observations of exoplanets do not fully match this theory.
Formation of the Solar System
The document summarizes the formation of the solar system from a large nebula of gas and dust. The nebula began to condense due to gravity, compressing and flattening into a disc. As it heated up from compression, fusion began in the center to form the early sun. Eventually, chunks of material in the disc collided and stuck together through accretion to form planetesimals, which were the building blocks of the inner, rocky planets that were warmer and the outer, gaseous planets that were cooler. Over time, the remaining gas and dust was blown away by the solar wind.
Planet Jupiter
Jupiter is a gas giant planet with 63 moons orbiting it. It is named after the Roman god Jupiter and has a diameter of 142,984km, making it the 5th planet from the sun. Interesting facts about Jupiter include that it takes almost 12 years to complete one orbit of the sun, 9 hours and 56 minutes to spin once on its axis, and has a large red spot of gas and rings up to 30km thick.
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The document discusses the 8 planets in our solar system - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. It describes their key characteristics such as composition, size, distance from the sun, temperature, and number of moons. The inner planets are smaller and rockier, while the outer planets are giant gas planets. Features such as rings are unique to Saturn. The document also provides details about specific planets like the extreme temperatures on Mercury and Venus.
Phases of the moon
The document discusses the phases of the moon over a lunar cycle. It describes the eight main phases as the moon revolves around Earth - new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent. These phases are based on the amount of the moon's surface that is illuminated by the sun. It also explains the related phenomena of tides, which are influenced by the gravitational pull of the moon and sun, and "blue moons", which refer to an extra full moon within a season or month.
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Earth's Rotation
The document discusses several key facts about Earth's rotation:
- Earth spins on an imaginary axis, completing one rotation every 24 hours at a speed of over 1,000 mph.
- Earth's rotation causes day and night and influences the number and placement of time zones around the world.
- Earth bulges slightly at the equator due to the centrifugal force of its rotation.
- Earth's tilted axis and yearly orbit around the sun influence the seasons and amount of sunlight different areas receive through the year.
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The document discusses the Earth, moon, and sun. It provides facts about each including that the Earth revolves around the sun every 365 days, rotates on its axis every 24 hours causing day and night, and the moon revolves around the Earth every 29 days. It also notes that the sun is the largest object in the solar system and discusses phases of the moon.
Solar system formation[1]
The document summarizes the Nebular Theory of solar system formation. It states that the solar system formed from a rotating cloud of gas and dust remnants from a supernova. As the cloud collapsed under gravity, it flattened into a disc and spun faster. The center became very hot and formed the Sun, while the planets formed from accretion of planetesimals in the disc. The terrestrial planets are rocky, while the gas giants formed from condensation of ices and gases in the outer solar system. However, some observations of exoplanets do not fully match this theory.
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The document summarizes the formation of the solar system from a large nebula of gas and dust. The nebula began to condense due to gravity, compressing and flattening into a disc. As it heated up from compression, fusion began in the center to form the early sun. Eventually, chunks of material in the disc collided and stuck together through accretion to form planetesimals, which were the building blocks of the inner, rocky planets that were warmer and the outer, gaseous planets that were cooler. Over time, the remaining gas and dust was blown away by the solar wind.
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Phases of the moon
The document discusses the phases of the moon over a lunar cycle. It describes the eight main phases as the moon revolves around Earth - new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent. These phases are based on the amount of the moon's surface that is illuminated by the sun. It also explains the related phenomena of tides, which are influenced by the gravitational pull of the moon and sun, and "blue moons", which refer to an extra full moon within a season or month.
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The moon orbits the Earth every 27 days on average at a distance of 384,400km. It was likely formed from debris ejected from Earth after a collision with a Mars-sized object. The different phases of the moon are caused by the illumination of its surface from the Sun as it orbits Earth. The moon's gravitational pull causes ocean tides on Earth and influences their size.
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The document summarizes theories about how our solar system formed from a collapsing cloud of gas and dust. It describes how:
1) Our solar system likely began from a giant interstellar cloud that collapsed under gravity and formed a rotating disk, with a dense center that became the Sun and a surrounding disk that formed the planets.
2) The solar nebula disk varied in temperature by distance from the Sun, allowing different elements to condense into planetary cores near and far from the Sun, forming the terrestrial and gas giant planets.
3) Asteroids and comets are remnants from solar system formation and provide clues about its early history through observations and analysis of their composition and orbits.
Stars
A star is a ball of plasma held together by gravity that undergoes nuclear fusion at its core, releasing electromagnetic radiation. Stars exist along a spectrum from hot, blue stars to cooler, red stars and can be classified based on their temperature, luminosity, and color. A star's life cycle begins as a contracting nebula and progresses through stages such as the main sequence, red giant, planetary nebula, and white dwarf before ending as a neutron star or black hole.
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The document summarizes theories about how our solar system formed from a collapsing cloud of gas and dust. It describes how:
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The Solar System consists of the Sun and everything that orbits around it, including eight planets that orbit closer to or farther from the Sun. There are also smaller objects like Pluto, asteroids, comets, and moons. The Moon is Earth's natural satellite, orbiting our planet every 28 days, and has no atmosphere or weather.
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The document discusses why we have years, days, and seasons on Earth. The Earth orbits the sun in 365 days, which makes up one year. The Earth spins on its axis once every 24 hours, creating day and night. Seasons occur because the Earth is tilted on its axis as it orbits the sun, causing different parts of the Earth to receive more or less sunlight throughout the year.
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The document provides an overview of planet Earth, including:
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Here are two potential responses in 2-3 sentences each:
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The document discusses imaginary lines used on maps and globes to describe locations on Earth, including meridians that run from the North to South poles and are measured in degrees east or west, and parallels that run horizontally around the planet and are measured in degrees north or south. It also briefly outlines that the Earth rotates on its axis over 24 hours, causing day and night, and that it has three main layers - the atmosphere, hydrosphere, and geosphere. Finally, it states that astronomers study objects in space like the sun, moon and planets.
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The document summarizes key facts about Earth:
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- With a diameter of around 8,000 miles, Earth is the fifth largest planet in the solar system and has one moon. The presence of water covering over 70% of the surface allows life to thrive.
- Earth rotates on its axis once every 24 hours and revolves around the sun once every 365 days, causing seasons and influencing climate.
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Motions of the Sky, Models of the Universe and Kepler's Laws of Planetary Motion
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Questions review Contemporary age. unit 3 (updated)
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Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
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With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
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s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
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7:个人信誉贷款加10分
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Social Unit1 Planet Earth 4th Grade
- 2. Imaginary lines On maps there are imaginary lines. We use these lines to describe a location on the Earth’s surface.
- 3. Imaginary lines On maps there are imaginary lines. We use these lines to describe a location on the Earth’s surface. > There are semicircular vertical lines from the North Pole to the South Pole. These are called meridians. > There are circular horizontal lines around the Earth. These are called parallels.
- 4. Imaginary lines We can combine longitude and latitude to describe any location on Earth. This is called a geographic coordinate.
- 5. The Earth’s movements The Earth has two different movements: revolution and rotation.
- 6. The Earth’s movements The Earth has two different movements: Revolution is the movement of the Earth around the Sun. The Earth takes 365 days and 6 hours to make a complete orbit of the Sun. Rotation is the movement of the Earth on its own axis. The Earth takes 24 hours to make a complete rotation.
- 7. The Earth’s movements Revolution Rotation
- 8. Discoveries Astronomers make discoveries by studying the Sun, the Moon, planets and other objects in space. Astronauts make discoveries by going into space.
- 9. Discoveries People originally believed that the Earth was flat. But in Ancient History, astronomers calculated it was a sphere. At the start of the 17th century, the telescope was invented. They used lenses to help us see objects far away.