Surface currents are caused by wind, and affected by the rotation of the Earth and the gravity of the moon (tides). When the oceans are deep, convection within the layers can also affect the flow of currents.
* While wind currents are greatly affected by uneven heating of the Earth's surface, there is no corresponding heating of the ocean bottom by the Sun. So currents do not form spontaneously at depth.
earths tilt (apex)
The difference in temperatures between the Equator and the north and south poles, plus the rotation of the earth, causes the air currents.
The difference in temperatures between the Equator and the north and south poles, plus the rotation of the earth, causes the air currents.
convection
Convection is the process that causes warm air to rise and cold air to sink. As such, the winds caused by this process are called convection currents.
Earth's tilt
convection current
A convection current in a beaker is formed when the temperature gradient causes fluid to heat up, become less dense, and rise. As the fluid rises, it cools down, becomes denser, and falls back down to be heated up again. This continuous cycle of rising and falling creates the convection current in the beaker.
The core of the earth contains radioactive material and this causes a convection current in the mantle.
When a material becomes hot enough, it rises because it less dense.
pressure increase causes temperature increase temperature increase causes pressure increase when volume is constant that's Boyle's law if the temperature increases the speed of the molecules increase and the number of collisions increases . different slant on the same thing i guess. Brown usually Brownian motion.
The main causes of convection in the asthenosphere are heat generated from the Earth's core, radioactive decay of elements within the Earth, and the movement of tectonic plates. As the material in the asthenosphere is heated unevenly, it becomes less dense and rises, while cooler, denser material sinks, creating a convection current.