The fact that, in general, liquids and gases expand when heated gives rise to
a) convection currents in fluids due to changing masses.
b) convection currents in fluids due to changing densities.
c) heat transfer by conduction.
d) convection currents in fluids due to constant temperatures,

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents