4. How does the density of Earth’s composition change as you get closer to the core?…
Density is an intensive property this means that it is independent of the amount of substance. For example the density of gold is the same for all gold substances regardless of their masses. This is a good way to distinguish…
Plate tectonic theory is a widely excepted theory that the Earth’s lithosphere is made up of plates, both oceanic and continental, which slowly move due to convection currents in the mantle and the asthenosphere. However, it is very hard to be certain as we can’t see the structure of the Earth, so some people do not agree with it. This theory saw the introduction of what we know today to be tectonic plates. Tectonic plates occur where there is radioactive decay in the core and temperatures are extremely high. This decay can occur anywhere in the earth’s core. This results in a plume of magma rising through the mantle creating a thermal current. When this current reaches the surface it spreads through the asthenosphere, before cooling and sinking. These are the convection currents which move tectonic plates. Convection currents will only occur in liquid form and in warm conditions. Tectonic plate theory has evidence to prove that these currents do take place. We know that the mantle is liquid and has high temperatures as magma that originates in the mantle is molten. This means that convection currents can occur. This part of plate tectonic theory is supported by global seismic activity because if convection current did not exist and plates were not able to move, earthquakes would not occur at any plate boundaries, but particularly at collision plate boundaries as there would be no plate movement.…
This theory was shown to be maybe correct when the mid-Atlantic ridge was discovered and a similar feature was discovered in the Pacific Ocean. After investigating it was suggested that sea floor spreading was occurring. Evidence for this was from alternating polarity of the rocks that form the ocean crust. Sea floor spreading implies that the Earth’s crust must be getting bigger. As we know this isn’t the case then the plates must be being destroyed somewhere to accommodate the increase in their size at mid oceanic ridges. Evidence was found with the discovery of huge oceanic trenches where large areas of ocean floor were being pulled downwards.…
The purpose of this experiment is to compare the different densities of different liquids. Density is a comparison between an object's mass and volume. Density = Mass divided by Volume. If the weight (or mass) of something increases but the volume stays the same, the density has to go up. If the mass decreases but the volume stays the same, the density has to go down. This experiment will show how the weight of certain liquids react to each other.…
The Earth's crust is lying on top of plates called tectonic plates. When changes in the Earths geological structure occur this may cause the tectonic plates to shift. When these plates shift that will cause the ground above it to move. These events are called earthquakes. The Three Gorges Dam may have been tied to major earthquakes including the one in May of 2008 which killed 87,000 people (Wu 1). The Three Gorges Dam is the largest dam in the world (Wu 1). It is located in China. With all the weight the dam puts the ground under it puts stress on the plates which causes them to shift and cause earthquakes. However, that…
Earthquakes are an example of seismic activity caused by the build-up of tension at the three types of plate boundaries: destructive, constructive and conservative. The pressure is suddenly released as the plates jerk past each other, sending out seismic waves from the focus that travel through different parts of the earth. The movement of convection currents within the Earth’s mantle causing the crust to become mobile which creates the different types plate margins, makes the cause due to physical factors. However human activity is suggested to be the cause of some minor earthquakes, for instance the building of large reservoirs where the water stresses the surface rocks or the subsidence of deep mine workings.…
BACKROUND: Density is a constant relationship between the mass and volume of a specific type of matter. Measurements of both mass and volume can be obtained for a metal sample. The relationship can be shown graphically by plotting the volume of a sample on the horizontal x-axis and the mass of the sample along the vertical y-axis. Plotting the values for several samples, a linear relationship can be seen for a density (slope=density).…
Drilling for oil in Alaska, specifically its North Slope region continues to be a controversial topic amongst environmentalists, politicians and the oil industry. The North Slope is home to the Arctic National Wildlife Refuge, as well as the Prudhoe Bay Oil Field and the Naval Petroleum Reserve No. 4, the first oil-drilling site in the state. The government established the 12-million acre Reserve No. 4 in 1923 as a way to supply oil for ensuring national security. There are many arguments for and against the expansion of oil-drilling in Alaska. These arguments are:…
Is it true that the cube with the most mass will have the most density?…
The experts and scientists have theories on how the the world's plates move and how earthquakes occur. These theories on how the world's plate move is called continental drift and the theory on how earthquakes occur is called plate tectonics. They also have a lot of information on the North American Plate and in which direction it is moving and information like that. Now let me tell you more about each of these topics.…
On the day of March 27, 1964 at 5:36 p.m the ground shook the lower part of Alaska that led to a destructive chain of events. The ‘1964 Great Alaska Earthquake’ was the largest earthquake ever recorded in U.S. history and ranked second in world’s most powerful recorded earthquake with a magnitude of 9.2. This earthquake lasted for about five minutes as the Pacific plate subducted under the North American plate located under Prince William Sound, Alaska. The shaking was felt estimating to about more than 1.3 million square kilometer, residence of the surrounding areas first believed that the Soviet Union has deployed a nuclear bomb on Anchorage, approximately 74.5 miles away from the epicenter. The aftershock of this large earthquake span about…
The similarity of southern continents’ geological formations had led Roberto Mantovani to speculate that all continents had once been a supercontinent and was smaller in its volume than it is now. Through volcanic activity, fissures are created in the crust causing this continent to break apart. However, this theory, known as the Expanding Earth Theory has since been proven incorrect.…
Introduction: the density of a substance is its mass per unit volume. (where P-density, m- mass and v- volume). Different materials usually have different densities and densities vary according to the pressure, temperature and purity of a substance. When measuring, there is always a small uncertainty or error and therefore no measurement is exact.…
Tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust. Along convergent boundaries, subduction carries plates into the mantle; the material lost is roughly balanced by the formation of new (oceanic) crust along divergent margins by seafloor spreading. In this way, the total surface of the globe remains the same. This prediction of plate tectonics is also referred to as the conveyor belt principle. Earlier theories (that still have some supporters) proposed gradual shrinking (contraction) or gradual expansion of the globe.[3]…