Another reason is the fact that water on Mars points to a similarity to Earth, as if perhaps it may have looked similar to Earth at a younger time. This is of great interest to us because if Mars did indeed contain oceans of liquid water as Earth does, the probability of life ever occurring on Mars would be great. The presence of water today is also very important. It opens the door for the idea of a possible human colony on the planet if the need ever arises. Water is essential to human survival and the transport of large quantities from Earth to Mars via Space shuttle would be incredibly expensive, so the ability to extract it from Mars for use on Mars would be the only way to make life on Mars practical.
This metastable radioactive isotope has a half-life of less than 5 minutes and is made from the radioactive decay of Cs-137 in a mini-isotope generator. Radioactive Ba-137m decays it turns into the non-radioactive
Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of living things. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. Water is a liquid at standard ambient temperature and pressure, but it often co-exists on Earth with its solid state, ice; and gaseous state, steam (water vapor). It also exists as snow, fog, dew and cloud Water is of major importance to all living things; in some organisms, up to 90% of their body weight comes from water. Up to 60% of the human adult body is water.
Why is it important? The oxygen in our atmosphere is important for breathing but also acts as a protection that shields us from harsh solar ultraviolet radiation. Much of this comes from another molecular form of oxygen, O(3), or
Farmers rely on nitrogen fixation for agriculture and the manufacture of fertilizer. It is also an important process in the manufacture of explosives. Nitrogen fixation occurs naturally in the air by means of lightning. Nitrogen fixation also refers to other biological conversions of nitrogen. 2.
1 AU b. 149,600,000 km c. 8.3 light-minutes d. all of the above 5. Distances between stars are usually measured in a. light-minutes b. astronomical units c. light-days d. light-years 6. Einstein developed an equation that changed ideas about the sun’s energy source by describing the relationship between a. mass and energy b. gravity
The theory that the earth was created about fourteen billion years ago by a “big bang” in outer space is the standard belief of modern science on how the earth was created. The theory states that the universe began in a hot, dense state and expanded rapidly creating the planets, including the earth, in the process. If this theory is correct, it is evidence against the teleological argument. The big bang theory is a scientific explanation for the creation of the earth, whereas the teleological argument just states that God was the creator of the universe. The teleological theory offers no scientific evidence, or evidence of any kind for the creation of the universe, it is based loosely on an analogy.
In another big announcement on Monday, using telescopes at the Hawaii-based Keck Observatory and the McDonald Observatory in Texas, astronomers at UC-Berkeley announced the discovery of the largest black holes to date -- two monsters with masses equivalent to 10 billion suns that are capable of consuming anything, even light, within a region five times the size of our solar system. The $600 million Kepler spacecraft peers at about 150,000 stars in the constellations Cygnus and Lyra, trying to detect any change in star brightness that suggests a passing planet. Three dips, or dimming, must be seen for confirmation. The Kepler science team uses ground-based telescopes and the Spitzer Space Telescope to review observations on planet candidates that the spacecraft finds, validating their
3 and 2 were very close in age. 3.) Fossil #4 came from the time just after the formation of the earth because Fossil #4 existed 4.5 billion years ago and the Earth originated 6 billion years ago. 5.) Yes, scientists can use more than one type of isotope to date the same rock or fossil because some can form around the same time and some can’t.
Below that is a liquid outer core of nickel and iron. At the center of Earth is a solid inner core of nickel and iron. Hydrosphere The hydrosphere contains all the solid, liquid, and gaseous water of the planet. **It ranges from 10 to 20 kilometers in thickness. The hydrosphere extends from Earth's surface downward several kilometers into the lithosphere and upward about 12 kilometers into the atmosphere.