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What is Pluto's surface gravity?
- By Forinfos
- 20/12/2025
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The ratio of these two surface gravities indicates that Earth's surface gravity is 17 times more powerful than Pluto's. A 17-pound object on Earth weighs only 1 pound on Pluto. The surface gravity of a planet is a function of its mass and volume. Pluto's mass, 1.31 x 10^22 kilograms, is only 0.22 percent of Earth's mass, which is 5.97 x 10^24 kilograms. Furthermore, Pluto's volume at 7.19 x 10^9 kilometers cubed is 0.66 percent of Earth's 1.083 x 10^12 kilometers cubed.
Why do solids, liquids and gases expand when heated?
- By Forinfos
- 20/12/2025
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Temperature itself is a measure of the level of energy in a substance. This energy correlates with the rate at which the molecules in the material move. At any temperature above absolute zero, the molecules in a substance are moving. As the temperature rises, the molecules begin moving faster. The faster the molecules move, the greater the average distance between the molecules becomes. If the temperature rises high enough, the material transforms from the solid state to the liquid state. Because a liquid’s molecules are farther apart from each other than they are in a solid, the liquid does..
Which American cities consistently experience the highest levels of pollution?
- By Forinfos
- 20/12/2025
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Pollution level rankings are determined in three ways: short-term particulate matter, ozone levels and year-round particulate matter. The most polluted city based on short-term and long-term particulate matter is Bakersfield-Delano, while the city with the worst ozone levels is Los Angeles-Long Beach. From all three categories, Californian cities consistently rank in the top five most polluted cities, with Bakersfield-Delano, Fresno-Madera and Los Angeles-Long Beach as repeat offenders on all three lists.
How does light interact with matter?
- By Forinfos
- 20/12/2025
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Taking the human body as an example of matter, low frequency electromagnetic waves, such as radio waves, pass through the body with almost no interaction. The transparency of radio waves to most forms of matter makes it possible to receive radio waves even when a radio receiver is not in direct line of sight of the emitting radio tower. As the frequency of the electromagnetic waves gets higher, the wavelength gets shorter.\nMicrowaves, infrared waves and visible light are all well absorbed by the matter of the human body. Microwaves are particularly dangerous in the sub-visible region of the e..
What do human heart valves look like?
- By Forinfos
- 20/12/2025
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The valves, made of strong muscle fiber, act as doors to the four chambers of the heart, allowing or preventing the flow of blood into and throughout the heart, as described by the American Heart Association. Certain infections cause the muscles of the valves to become inflamed and swollen, which can affect their ability to function properly, as WebMD describes.
Who are famous volcanologists?
- By Forinfos
- 20/12/2025
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The Kraffts, who were from France, visited hundreds of volcanoes in their lifetimes, using their knowledge and images to help develop hazard mitigation efforts in a number of nations. Their 1991 deaths occurred when they were hit by a quick-moving current of rock and gas during a volcanic eruption. A fellow volcanologist, Garry Glicken, and nearly 40 journalists died along with them, according to OSU's "Volcano World."\nJohnston also died during a volcanic eruption. In his case, the event occurred on May 18, 1980, at Mount St. Helens in Washington State when he was swept away by debris re..
Does gold have an odor?
- By Forinfos
- 20/12/2025
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Gold is one of the most famous metals in the world and has been for thousands of years. The soft metal is one of the few elements that occurs in its natural state.\n\nGold can be used in a number of ways. Most famously, it is used as an investment option by people around the world. It can also be manipulated into thin sheets and used for decorative elements and designs, and it is commonly used in jewelry for both men and women.
What is the lunitidal interval?
- By Forinfos
- 20/12/2025
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Calculating the local lunitidal interval requires an awareness of such conditions as the shape of the coastline, the slope of the continental shelf and a number of other factors that affect the movement of ocean water. In places where the topography is complex, such as New York harbor, the interval can be as high as eight hours.
Where do most hurricanes form?
- By Forinfos
- 20/12/2025
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The warm air rises above the ocean's surface, and surrounding air rushes into the low pressure area that is left behind by the warm air. The new air in the low pressure area also becomes warm and moist, rising and motivating the swirling wind pattern. The warmed air cools as it rises, and the evaporated water vapor forms clouds. When the swirling winds reach a speed of 39 mph, the storm is called a "tropical storm." At 74 mph, the storm is officially a hurricane.
What is silicon made of?
- By Forinfos
- 20/12/2025
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Silicon is the second most abundant element on Earth and is found most often in the crust bonded with two oxygen atoms to form silicon dioxide. This compound presents most often as common sand, but can take on other mineral forms. Silicon also joins with carbon to create silicon carbide, used as a diamond-hard abrasive.