In German meteorologist Alfred Wegener, impressed by the similarity of the geography of the Atlantic coastlines, explicitly presented the concept of continental drift. Though plate tectonics is by no means synonymous with continental drift, the term encompasses this idea and derives much… The idea of a large-scale displacement of continents has a long history. Noting the apparent fit of the bulge of eastern South America into the bight of Africa, the German naturalist Alexander von Humboldt theorized about that the lands bordering the Atlantic Ocean had once been joined.
Fill the clear jar halfway with cold water. Place the jar freezer for 15 minutes. Add 10 drops of blue food coloring to the hot water and stir. Remove the jar from the freezer and set it on table. Wait until all the sloshing around from moving it has stopped. Fill the dropper with hot blue water.
Lower the tip of the dropper until it is near the bottom of the large jar. Carefully release two drops of hot blue water onto the cold water. Observe what happens, looking at the side and top of the jar. Add ten more drops, two drops at a time, observing what happens between each.
Once you have added all the hot blue liquid drops, observe the jar for an additional five minutes.
Ripples of blue color move through the water. A blue layer forms at the top of water in the jar. As time goes by, some of the blue water begins to sink, and after five to ten minutes, all of the water turns a lighter shade of blue. The hot blue water molecules had more kinetic energy than the cold water molecules.
That means the blue water molecules were colliding more, and pushing each other part. This lowered the density of the blue water because fewer molecules could fit in the given volume.
The less dense blue water therefore rose through the cold water and floated at the top. Those streams of blue fluid you saw were convection currents. Over time, thanks to the convection currents, the hot water mixed with the cold water, evening out the temperature overall.
The blue food coloring also diffused throughout the liquid.
The blue food coloring molecules moved from higher concentration in the hot water and zero concentration in the clear water to create a more uniform distribution throughout the liquid, giving it an even, light blue appearance.
Going Further Do some research on warm and cold ocean currents. Water of different temperatures can move hundreds of miles! Disclaimer and Safety Precautions Education. In addition, your access to Education. Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances.
Implementation of any Science Project Idea should be undertaken only in appropriate settings and with appropriate parental or other supervision. Reading and following the safety precautions of all materials used in a project is the sole responsibility of each individual.
For further information, consult your state's handbook of Science Safety. Related learning resources Science project Heat Capacity of Water vs.Plate Tectonics: The Rocky History of an Idea. Close examination of a globe often results in the observation that most of the continents seem to fit together like a puzzle: the west African coastline seems to snuggle nicely into the east coast of South America and the Caribbean sea; and a similar fit appears across the Pacific.
CONVECTION OVERVIEW The students will describe and discuss a convection current. They will set up an experiment that illustrates convection currents and observe the movement of water over a heat source by putting drops of tor to diagram the hypothesis and to chart the movement of the food color drops.
Convection currents can be found in the boiling of liquid, the heat of a campfire, the weather, and even the magma in the earth. Quick Notes Convection currents are formed by the difference in.
Continental drift, large-scale horizontal movements of continents relative to one another and to the ocean basins during one or more episodes of geologic benjaminpohle.com concept was an important precursor to the development of the theory of plate tectonics, which incorporates it.
The convection current hypothesis For appropriate values of the physical parameters of the mantle it seems likely that the Rayleigh number for mantle‐wide convection is far in excess of the value necessary for marginal instability.
convection teriminin İngilizce İngilizce sözlükte anlamı The process of conveying something The transmission of heat in a fluid or gas by the circulation of currents The vertical movement of heat and moisture, especially by updrafts and downdrafts in an unstable air mass.