Science

A:

Earth is considered to be the "third rock from the sun." That phrasing is used because Earth is the third planet from the sun, as well as being a terrestrial (rocky) planet.

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    • How do space craters get their names?

      Q: How do space craters get their names?

      A: The International Astronomical Union (IAU), an organization of astronomers, names the craters on planets and moons in the solar system by giving each planet a creative theme. For example, the moon’s craters are usually named for deceased explorers, scientists and scholars, while large craters on Venus are named for famous women in various professional fields.
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    • What does seeing a shooting star mean?

      Q: What does seeing a shooting star mean?

      A: Seeing a shooting star means that a meteor is plummeting toward earth. The glowing appearance is caused when the meteor's surface catches on fire upon entering the Earth's atmosphere. A shooting star, therefore, is not actually a star.
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    • What causes the Cassini division in Saturn's rings?

      Q: What causes the Cassini division in Saturn's rings?

      A: The Cassini Division, a gap in the rings of Saturn, is caused by gravitational pull from Saturn’s moon Mimas. The moon’s gravity affects the tiny particles that make up the rings, creating what looks like empty space. Other divisions in Saturn’s rings are the result of similar interactions with the planet’s moons.
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    • What is the circle of illumination?

      Q: What is the circle of illumination?

      A: The circle of illumination is the line that separates the Earth to create equal parts of day and night. It passes through the poles and allows the entire Earth to have an equal amount of time spent during the daylight and nighttime hours.
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    • What is Jupiter's atmosphere made up of?

      Q: What is Jupiter's atmosphere made up of?

      A: The atmosphere of Jupiter consists of 90 percent hydrogen gas and nearly 10 percent helium. However, its atmosphere has trace amounts of ammonia, sulfur and water vapor. Jupiter is a gas giant that is also the biggest planet in the solar system.
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    • What types of equipment do astronomers use?

      Q: What types of equipment do astronomers use?

      A: According to NASA, modern astronomers’ tools include advanced telescopes capable of studying light reflected from the sun, moon, planets, comets and stars. Radio telescopes are utilized in the study of radio waves, while space-borne gamma ray telescopes aid in the study of gamma rays.
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    • What is a biological key and how is it used?

      Q: What is a biological key and how is it used?

      A: A biological key, also known as an identification key or a dichotomous key, is a way to classify organisms by giving the classifier two options in each stage until identification occurs. For example, in order to identify the tree, a biological key gives two choices – conifer or broadleaf – with a description of each one. Depending on the answer, another question pops up to narrow down the species.
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    • What are the organelles that break down sugar to produce energy?

      Q: What are the organelles that break down sugar to produce energy?

      A: Texas A&M University indicates that the organelle that breaks down sugar to produce energy is the mitochondria. This process, which involves turning sugar into energy, is called cellular respiration.
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    • How do fish breathe?

      Q: How do fish breathe?

      A: Fish require oxygen for survival just like other animals, but they filter it from water using specialized organs called gills. A fish draws in oxygen-rich water and passes it through its gills. The organs absorb the oxygen from the water, carrying it into the fish's bloodstream for use by its organs.
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    • What is a susceptible host?

      Q: What is a susceptible host?

      A: A susceptible host is a member of a species population who is at risk of becoming infected with a certain disease due to a variety of reasons. Susceptible hosts differ from the general population because they are far more likely to get infectious diseases than the general population.
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    • How do plants get rid of waste?

      Q: How do plants get rid of waste?

      A: Plants get rid of waste through a process called excretion. Different waste products are excreted in different ways.
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    • Where are chromosomes located?

      Q: Where are chromosomes located?

      A: Chromosomes can be found in the nucleus of every plant and animal cell; these combinations of DNA and protein are essential components of genetic information. DNA is a long chain of genetic information that would not be able to fit inside a cell without the structural assistance of chromosomes, and this information helps determine a plant or animal's individual traits, including physical characteristics and behavioral capabilities. The DNA that is contained in chromosomes is passed from parents down to offspring.
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    • What happens when oxygen reacts with copper?

      Q: What happens when oxygen reacts with copper?

      A: The combination of oxygen and copper produces the substance called copper oxide. The formation of copper oxide requires a specific formula; the creation of this element ultimately produces a gas that resides in the atmosphere.
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    • Why are alloys used?

      Q: Why are alloys used?

      A: Alloys mix metals with other elements to help harden and otherwise make them more useful. For example, gold is too soft to make good jewelry on its own, but it can be mixed with other elements, including harder metals like zinc and nickel, to help make it strong enough to be formed into rings and other jewelry pieces.
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    • Where can Krypton be found?

      Q: Where can Krypton be found?

      A: Krypton is a chemical element that can be found in trace amounts in the atmosphere. It is a colorless, odorless and tasteless noble gas that can be isolated by fractionally distilling liquefied air.
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    • Is neon a metal or a non-metal?

      Q: Is neon a metal or a non-metal?

      A: According to the Encyclopedia Britannica, neon is a gas, not a metal. The source states that it is an inert gas and is one of the noble gases in the periodic table.
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    • What is the texture of helium?

      Q: What is the texture of helium?

      A: According to Elemental Matter, helium is a gaseous substance, and gases do not have texture. They do have other identifying qualities. Specifically, helium is a noble gas, which means that it is part of section 18 on the periodical table.
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    • What substances make up crude oil?

      Q: What substances make up crude oil?

      A: Crude oil mainly consists of hydrocarbon molecules, but impurities, such as sulfur, nitrogen, oxygen, iron, arsenic, vanadium, copper, nickel, sodium chloride, calcium chloride and magnesium chloride, are also present. The hydrocarbon molecules include straight chains, branched chains and rings.
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