science Flashcards
What is the definition of CONVECTION?
A hot liquid or air that expands, becomes less dense, and rises or becomes more dense, and sinks.
Warm air is _______ dense than cold air and rises creating convection currents.
Less
Warm air near the Earth’s surface rises and then cools and drops, this creates a ________________ in the atmosphere.
Convection current
Define air mass
A large region of air that has similar temperature and humidity.
Density can be described as
How tightly packed the matter of a substance is.
The reason that we have currents in the ocean and in the atmosphere is:
The sun heats the atmosphere and ocean unevenly, making some areas warmer than others.
In what direction do winds always blow?
From areas of higher pressure to areas of lower pressure.
Ocean currents affect which two things in the land areas they flow next to?
Temperature and weather
What process brings the deep cold Ocean currents up to the surface?
Upwelling
How do Ocean currents affect the climate of locations near them?
Warm Ocean currents cause more extreme climates and cold Ocean currents cause more moderate climates.
What effect do ocean currents have on the weather experienced by locations on land that are close by?
Locations near the ocean will tend to have a narrower range of temperatures and more precipitation.
How are the convection currents in the student’s model different from the convection currents in Earth’s atmosphere and oceans?
The heat source for Earth’s atmosphere and oceans is the sun, which heats from above instead of below.
