What are earthquakes caused by?
GeologyEarthquakes are the result of sudden movement along faults within the Earth. The movement releases stored-up ‘elastic strain’ energy in the form of seismic waves, which propagate through the Earth and cause the ground surface to shake. What is the main cause of earthquakes? Earthquakes are usually caused when underground rock suddenly breaks and there
What would happen if the global conveyor belt shut down?
GeologyIf ocean currents were to stop, climate could change quite significantly, particularly in Europe and countries in the North Atlantic. In these countries, temperatures would drop, affecting humans as well as plants and animals. In turn, economies could also be affected, particularly those that involve agriculture. What will happen if the global conveyor belt stops?
What are tectonic plates GCSE?
GeologyTectonic plates are sections of the Earth’s solid crust that “float” on top of the mantle. The mantle contains hot molten rock (magma) heated by energy from the earth’s core. The earth’s crust is made up of seven main tectonic plates and numerous smaller plates. What is a tectonic plate Bitesize? Tectonic plates are pieces
What are two radioactive isotopes that are useful for dating rocks that are older than 10 million years?
GeologyScientists usually use the potassium-argon method to date rocks that are older than about 1 million years. Uranium-238 is also used for radiometric dating. What radioactive isotope is best used for dating rocks that are millions of years old? isotope carbon-14 The best-known radiometric dating method involves the isotope carbon-14, with a half life of
How did the Llano Uplift form?
GeologyCreation of the Area When the surrounding area of younger sedimentary rocks eroded away, it left behind granite at the heart of the uplift. Along with the rest of the Texas Hill Country, the Llano Uplift also rose in elevation during the Cenozoic when the Balcones Fault shifted, lifting the area to the west. What
What were the impacts of the Montserrat eruption?
GeologyWhat is the environmental impact? Forests and beautiful scenery were destroyed, and the giant beaches that attract many tourists were ruined. Because of the lava erupting from the volcano, over half the island had to be evacuated to a safer part. It caused fires and mudflows, resulting in injuries or even deaths. What were the
Is glass a mineral?
GeologyGlass – can be naturally formed (volcanic glass called obsidian), is a solid, its chemical composition, however, is not always the same, and it does not have a crystalline structure. Thus, glass is not a mineral. Is glass made of minerals? It is made from silica sand, soda ash and limestone and/or dolomite. The oxides
What is a fold in rock that bends upward?
GeologyAnticline. a fold in rock that bends upward into an arch. Compression. What are bends in rocks called? The bending or breaking of rock is called deformation or strain. If rocks tend to break, they are said to be brittle. If a rock breaks, it is said to undergo brittle behavior. If rocks tend to
What was the climate like in the Tertiary Period?
GeologyThe tertiary period climate during the beginning was very warm and moist compared to today’s climate. Much of the Earth was tropical or subtropical. Plant trees grew as far North as Grasslands. The climate began to cool by the middle of the tertiary i.e. during the Oligocene epoch. What was it like during the Tertiary
What are the three most common cements?
GeologyThe three, most common, chemical cements in sedimentary rocks such as sandstone are silica (quartz), calcium carbonate (calcite), and the iron oxides. What are the 3 most common cements? The most common cements are carbonates (especially calcite, aragonite, dolomite, and siderite), silicates (primarily quartz, opal, clay minerals, and zeolites), sulfates (especially gypsum and anhydrite) and