what are the circumstances under which convection can occur in a substance?

Convection only happens with fluids, materials that can flow. Liquids can flow (think of water) and gases can flow (think of wind). Solids are stuck in place so they can’t flow and since they can’t flow, there is no convection. The way heat transfers through solids is conduction.

What is needed for convection to happen?

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated.

What are the conditions necessary for a terrestrial planet?

What are the conditions necessary for a terrestrial planet to have a strong magnetic field? Both a molten metallic core and reasonably fast rotation. Which of the following describes volcanism? The eruption of molten rock from a planet’s interior to its surface.

Which two factors are most important to the existence of plate tectonics on Earth?

What two factors are most important to the existence of plate tectonics on Earth? mantle convection and a thin lithosphere. Mantle convection helps move the plates, and the plates probably exist because the lithosphere was thin enough to break into these plates.

What are the examples of convection?

13 Examples Of Convection In Everyday Life
Breeze. The formation of sea and land breeze form the classic examples of convection. Boiling Water. Convection comes into play while boiling water. Blood Circulation in Warm-Blooded Mammals. Air-Conditioner. Radiator. Refrigerator. Hot Air Popper. Hot Air Balloon.

Where does convection occur in a house?

A simple example of convection currents is warm air rising toward the ceiling or attic of a house. Warm air is less dense than cool air, so it rises. Wind is an example of a convection current.

Can convection occur within all fluids?

Convection may happen in fluids at all scales larger than a few atoms. There are a variety of circumstances in which the forces required for convection arise, leading to different types of convection, described below. In broad terms, convection arises because of body forces acting within the fluid, such as gravity.

What are the three main sources of convection?

The primary sources of thermal energy for mantle convection are three: (1) internal heating due to the decay of the radioactive isotopes of uranium, thorium, and potassium; (2) the long-term secular cooling of the earth; and (3) heat from the core.

What fluids are involved in convection?

convection, process by which heat is transferred by movement of a heated fluid such as air or water. Natural convection results from the tendency of most fluids to expand when heated—i.e., to become less dense and to rise as a result of the increased buoyancy.

What causes convection?

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.

How does convection occur in air?

Convection happens because warm air is less dense than the cold air around it, so it is lighter and rises or goes up in the atmosphere. Evidence of convection happening is seen with the formation and growth of cumulus clouds.

How does convection occur in the troposphere?

The uneven heating of the regions of the troposphere by the sun ( the sun warms the air at the equator more than the air at the poles )causes convection currents, large-scale patterns of winds that move heat and moisture around the globe.

Under what circumstances can differentiation occur in a planet quizlet?

Under what circumstances can differentiation occur in a planet? The planet must have a molten interior. the rigid rocky material of the crust and uppermost portion of the mantle. What is the most important factor that determines the thickness, and therefore strength, of the lithosphere?

What are the 4 characteristics of terrestrial planets?

Terrestrial planets are Earth-like planets made up of rocks or metals with a hard surface. Terrestrial planets also have a molten heavy-metal core, few moons and topological features such as valleys, volcanoes and craters.

What is required for a terrestrial planet to have a global magnetic field?

What are the basic requirements for a terrestrial world to have a global magnetic field? A core layer of molten, convecting material and sufficiently rapid rotation.

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