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Answer link. convection currents occur when a heated fluid expands, becoming less dense, and rises. The fluid then cools and contracts, becoming more dense, and sinks. Convection currents are an important form of heat transfer. Convection occurs when heat cannot efficiently be transferred through radiation or thermal conduction.
Explanation: Convection currents happen in fluids with a heat source. Hot liquid or gas near the heat source becomes hotter and less dense, so moves upwards. This forces the cooler stuff at the top to move back down. As the hot molecules move up, they cool down and begin to drop. As the cool molecules move down, they heat up and begin to rise.
Convection currents is related to plate tectonics because it explains the reason why plate tectonics move. For instance, some geologists believe that the main factor for the motion of plate tectonics is convection currents that occurs in the mantle. This is because the mantle is made of semi-molten rock called magma. In addition, just as convection currents occurs in a boiling pan this same ...
It is present in the strong winds at the seaside and in the magma in the Earth 's mantle. Convection currents occur when a fluid is near a heat source. Heat sources provide energy to their surroundings. When fluid receives this energy, molecules inside it move around more, spacing out from each other and lowering the density.
one way is that convection currents are thought to be the driving force of plate tectonics that shape and reshape the earth's crusts forming oceans, mountains and continents. Convections currents in the earth's mantle are thought to be the driving force of plate tectonics. Where the hot magma is brought near the surface by the convection currents a divergent boundary is created. The divergent ...
Convection currentls cause warm air to move upwards. Warm air rizes and is replaced by cooler air from the surrounding area. The warm air eventually cools off, falling down and replacing more warm air. This causes a constant upward flow sometimes called a thermal that allows large birds to soar without effort. The image below shows a glider rather than a bird, but the same principles apply:
As the magma cools and solidifies, the convection currents will stop and the Earth will become geologically dead. Convection currents within the Earth's mantle are caused by hot material rising upwards, cooling, then dropping back toward the core. These currents are thought to be the driving force for tectonic plate activity in the crust. The moving magma in the mantle carries the plates ...
Explanation: The air is heated by the radiator this causes the particles to become less dense meaning they rise because lots of particles are rising at the same time this means that there is a concentration gradient or air particles this means that the particles will diffuse across the room. Answer link. It is because of diffusion The air is ...
Explanation: Convection currents occur when a reservoir of fluid is heated at the bottom, and allowed to cool at the top.. Heat causes the fluid to expand, decreasing its density. If there is cooler material on top, it will be more compact and therefore, will sink to the bottom. The heated material will rise to the top.
The best example is a sea breeze. Convection occurs when the Earth is heated unevenly. The air over the Earth will heat according to how fast the Earth under it heats. That part of the atmosphere that heats faster will expand. This relationship between heat and volume is Charles Law. Since the volume increases the pressure will drop. This is due to the fact that air masses do not readily mix ...