reflect sunlight
Yes, everything has albedo. Albedo refers to the reflectivity of any object or substance. White clouds have a high albedo - they reflect a lot of light. Dark clouds have a lower albedo; they don't reflect as much.
Clouds with high albedo reflect more incoming solar radiation back into space, which can lead to a cooling effect on the Earth's surface by reducing the amount of solar energy absorbed. This can influence the Earth's energy balance and may contribute to a decrease in global temperatures.
Cumulonimbus. Thunderstorm clouds are typically very thick and therefore have a high albedo (not very much sunlight penetrates through to the ground, most gets reflected off of the top). Therefore, these clouds appear grey and dark on the bottom.
Clouds reflect sunlight because of their high albedo, which is the ability of a surface to reflect light. This means that they send a significant amount of sunlight back into space, contributing to cooling the Earth's surface.
Because snow reflects light more than non-white regions of the Earth and albedo is a measurement of reflectance. By definition white reflects all visible light therefore albedo is greatest .
The average overall albedo of Earth, itsplanetary albedo, is 30 to 35%, because of the covering by clouds, but varies widely locally across the surface, depending on the geological and environmental features.
Probably snow, if your Earth includes the totality of items found on the planet. Some clouds would have an albedo almost as high - but only in parts. If you wish to limit your answer to earth solids, then perhaps milky quartz, and marble would have a high albedo.
Albedo means reflectivity. The higher the albedo, the more light (and heat) is being reflected. Generally, the darker the color, the lower the albedo : most of the energy is absorbed. Snow has a fairly high albedo, as do clouds. Black tar roofs have a very low albedo.
The albedo of Mars is .15; you can see the albedo of all of the planets and moons in the solar system at the Nine Planets web site, linked below. "Albedo" is a measure of how reflective a body is. The higher the number, the more reflective the surface. So a high albedo says that a planet or asteroid reflects most of the light that hits it, while a low albedo indicates that most of the light is absorbed. Albedo can make calculations about climate change difficult. A planet with a high albedo reflects much of the Sun's light and heat, causing it not to heat up as much. A low albedo means that all of the solar radiation is absorbed and turned into heat. A warmer world will have less snow and ice cover, and thus a lower albedo, resulting in higher temperatures. On the other hand, a warmer world might have more clouds, which would increase Earth's albedo, reflect more sunlight, and reduce the heating effect. However, clouds also act to trap heat, sort of like a blanket. Whether the albedo effect would offset the "blanket" effect of clouds would depend on the type and height of the clouds and where they are located. Cloud effects are among the most important sources of uncertainty in modeling future climate change.
No, a high albedo does not increase temperature. Albedo refers to the amount of sunlight reflected by a surface, so a high albedo means more sunlight is reflected and less is absorbed, which can help to keep temperatures lower.
An object that has a high albedo is one that is highly reflective, but a poor absorber. An object that has a low albedo is one that does not reflect well, therefore, is a good absorber. This means that a black object has low albedo.
Snow has a high albedo, meaning it reflects a lot of sunlight back into the atmosphere.