events are major pieces of evidence towards proving that plate tectonics theory is valid (40 marks) The theory of plate tectonics states that the Earth’s lithosphere (top layer of the Earth’s crust) is split up into rigid sections called plates that are moving relative to one another as they move on top of the underlying semi-molten mantle. These plates are either continental‚ The North American Plate‚ or oceanic‚ The Nazca Plate. Tectonic plates are powered by convection currents‚ which is the circular
Premium Plate tectonics
Evaluate how Plate Tectonic Theory helps our Understanding of the Distribution of Seismic and Volcanic Events (40 marks) The Plate Tectonic Theory developed in the late 1960’s‚ when people noticed how continents either side of the Atlantic Ocean seemed to almost fit together. Francis Bacon‚ an English Philosopher was aware of this as early as 1620. Topographical and geological evidence built up and allowed Alfred Wegener to publish a theory in 1912‚ suggesting that the continents were once all joined
Premium Plate tectonics
differed between my group’s nutrient agar and MAC agar plates. In courgette‚ there was moderate growth in nutrient agar while it was heavy in Mac agar. In beef broth‚ there was slight growth in nutrient agar while it was negative in MAC agar. In fresh basil‚ growth was heavy in nutrient agar while it was heavy in MAC agar. Where cottage cheese was the ingredient‚ both plates had heavy growth. For walnut‚ growth was slight in nutrient agar while it was negative in MAC agar. Generally‚ the slight difference
Premium Bacteria Escherichia coli Antibiotic resistance
Agar What is it and where is it from? Derived from the cell walls of red algae‚ agar is a gelatinous substance extracted through a process of boiling and filtration. Agar is specifically used in laboratories for diagnostics and experimental purposes. Agars main purpose is to act as a growth medium for micro-organisms such as bacteria and fungi. The micro-organisms feed off the nutrients contained in Agar and can be both cultured and observed within it by scientists and the use of a microscope. Using
Premium Staining Bacteria Microscope
gram-negative. It is necessary to first separate the two organisms by inoculating a nutrient agar plate using the streak-plate method. The initial streak-plate procedure was performed and placed in the incubator at 37◦C for 24-48 hours. Upon observing the growth on this plate‚ it is fairly obvious that one of the organisms is Serratia marcescens. However‚
Premium Bacteria Microbiology Microorganism
“Volcanic and seismic events are major pieces of evidence towards proving that plate tectonics theory is valid’ Discuss the extent to which you agree with this statement (40 marks) The plate tectonics theory was made by a German named Alfred Wegener. He stated that a single continent existed about 300 million years ago named Pangaea and that it split into two continents of Laurasia in the north and Gondwanaland in the south. Today’s continents were formed by further splitting of the two masses
Premium Plate tectonics
pieces of evidence towards proving that the plate tectonic theory is valid” Discuss the extent to which you agree with this statement (40). The theory of plate tectonics explains the structure and motion of the Earth’s lithosphere. The theory states that the Earth’s crust is split into large sections called tectonic plates‚ and these move relative to one another creating boundaries at which the plates converge‚ diverge or move past each other. These plates are either continental or oceanic and are
Premium Plate tectonics
Diffusion in agar cubes Introduction: All cells are dependent on a processes called diffusion‚ which is the movement of a substance from an area of higher concentration to an area of lower concentration. Cells need to obtain certain essential substances‚ like oxygen‚ for their survival. The rate of diffusion is said to be dependent upon the various factors: Size of molecules that have to diffuse‚ concentration gradient‚ the distance across which diffusion occurs‚ number of pores/openings‚ surface
Free Molecular diffusion Diffusion
Examination of Bacterial Plates Objective: 1. To examine bacteria pigmentation‚ colony‚ margin characteristics‚ elevation properties‚ broth characteristics and agar stroke properties. 2. To examine bacteria growth characteristics on different culture media. Introduction: Bacterial species can sometimes be identified on the basis of how they appear on or in the different media. The pigmentation‚ size and shape of bacterial colonies as they grow on and in agar plates can provide identifying
Free Bacteria Staining
The natural hazards caused by plate tectonics are more a result of human factors than physical ones. Discuss to what extent do you agree with this statement? [40 marks] A natural hazard is a threat of a naturally occurring event that will have a negative effect on people or the environment. The Earth’s lithosphere (crust) is divided into tectonic plates which are constantly in motion due to the convection currents caused by heat cycles in the mantle‚ driven by radioactive decay in the Earth’s core
Premium Volcano Plate tectonics