They changed because the molecules of hydrogen and helium were moving so fast that they eventually escaped the Earth. 14. Explain how the greenhouse effect works and how it relates to global warming. The greenhouse effect is when radiation at visible wavelengths passes freely through the atmosphere and is absorbed at the ground. The ground heats up and emits infrared radiation.
When the source of hydrogen in the Universe is exhausted, all the stars will burn out and die. 3. The gravity of the Universe may become so great that it will bring all matter in the Universe back together and the Universe will collapses into black holes. 4. It is, therefore, true to say that everything that exists in the Universe is not permanent.
Evidence of sea floor spreading can be found in the Atlantic, where it is believed that the North American and Eurasian plates are moving apart at a constructive plate margin. New land has been created due to the magma rising through a rift and cooling quickly on the surface, also creating a ridge of volcanoes called the Mid-Atlantic ridge. The
Hydrologic Cycle The elements that combine to make water Hydrogen and oxygen are found in dust, grasses, and other stuff that formed Earth. The molten rock, called magma, which made up early Earth, contains water. Some water escaped from the magma and reaches the Atmosphere. As Earth cooled off, the water was able to settle on the surface and billions of liters later the oceans were formed. (5 points) |Score | | | 2.
Low density polyethylene (LDPE) – involves an older gas phase process (still used) with conditions: high pressure (1000-3000 times atmospheric), high temperature (300°C) and an initiator (an organic peroxide e.g. dibutyl peroxide, or oxygen). The resultant product has significant chain branching due to alkyl groups replacing hydrogen atoms on some carbon atoms. Consequently, the alkane chains cannot pack together in an orderly fashion, resulting in low densities and weak dispersion forces; therefore LDPE is soft, flexible and has a low melting point. The initiator isn’t strictly a catalyst as it is involved in the actual formation (one initiator molecule per ½ polymer molecule).
Describe two ways in which gravity has a part in the life-cycle of a star- Gravity pulls the dust and gas in the nubula together, and compresses them so much that the inside becomes hot enough for fusion reactions to start. Gravity also pulls the remains of a red giant together after fusion reactions have stops. This forms a white dwarf. Theories about the universe- 1. What does red shift tell s about distant galaxies?
This type of volcano can be recognized by its broad, gentle slopping shape. The lava dome that composes a shield volcano is usually built over a period of time. When this type of volcano erupts it often involves a flow after flow of lava. An example of shield volcano is Mauna Kea, which along with Mauna Loa forms the large island of Hawaii. The largest shield volcano in the solar system is Olympus Mons, on the planet mars.
8. How does hornfels form? Rock contacts with magma and bakes rock. 9. Know that the type of metamorphic rock relates to how much heat and pressure the rock was exposed to.
Look at the chart below to see which elements are typically formed in supernova and which ones are not. 7. What is a supernova? (1 point) A supernova is the explosion of a star of big volume and mass also known as the death of a star. a. Fluorine | f. Manganese | b. Potassium | g. Iron | c. Titanium | h. Nickel | d. Vanadium | I. Zinc | e. chromium |
These potential causes can be grouped together to be dismissed, having a similar end result. Nuclear war and the less likely, but still possible, gamma ray burst can be easily dismissed due to the lack of one key condition. A gamma ray burst is a type of explosion caused by a star nearing supernova. Its explosion sends a massive amount of radiation and energy in a very compact beam that could easily bake the planet with enough radiation that nearly all forms of complex life, humans included, would perish quickly. The resulting nuclear winter would occur causing the aforementioned minor ice age event, but it is the lack of radiation that prevents this from being a possible answer.