What are convection currents and what causes them quizlet?
A convection current is the flow that transfers heat with in a fluid. Heating and cooling of the fluid, changes in the fluid density, and the force of gravity, combine to set convection currents in motion. Heat from the core and the mantle itself cause convection currents in the mantle.
What causes convection current in the Earth’s mantle?
Convection Currents in the Mantle Heat in the mantle comes from the Earth’s molten outer core, decay of radioactive elements and, in the upper mantle, friction from descending tectonic plates. Relatively cooler rock from higher in the mantle slowly sinks toward the mantle.
What causes convection currents for kids?
Convection currents occur when there are significant differences in temperature between two parts of a fluid. When this happens, hot fluids rise and cold fluids sink. This causes movements or currents in the fluid. Atmospheric circulation, for example, is made by convection currents.
What is convection in Kids terms?
Kids Definition of convection : motion in a gas (as air) or a liquid in which the warmer portions rise and the colder portions sink Heat can be transferred by convection. convection. noun. con·vec·tion | \ kən-ˈvek-shən \
What is the process of convection for kids?
Convection is a way in which heat travels. It occurs when heat is transferred by the movement of liquids or gases. Natural convection occurs when fluids are heated. When the fluid molecules are heated, the fluid becomes larger and lighter.
What is the importance of convection?
In the atmosphere, as air warms it rises, allowing cooler air to flow in underneath. Along with the turning of the Earth, this movement of air creates winds. Winds, in turn, create surface waves on the ocean. Convection also plays a role in the movement of deep ocean waters and contributes to oceanic currents.
What is an example of forced convection?
Forced convection: When external sources such as fans and pumps are used for creating induced convection, it is known as forced convection. Examples of forced convection are using water heaters or geysers for instant heating of water and using a fan on a hot summer day.
Is ice melting an example of convection?
Yes, the melting of ice is an ideal example of convection. Ice melts since heat moves to the ice from the air.
Is ice melting conduction or convection?
Read this answer and compare it to your own. Ice is at a temperature of 0 °C; the surroundings are at about 20 °C. For ice to melt, it must gain energy from the surroundings. Energy can be transferred (move) from the surroundings to the ice by conduction through the metal or plastic.