Definition: this is an elementary, mass-less particle, and is the basic unit of light and all other forms of electromagnetic radiation.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

The energy required to vaporize a certain amount of a substance is greater than the amount of energy necessary to raise the temperature of the same amout of that substance by 1 degreee celcius

Can create a hboth of these instruments can measure wind speed. doppler radar and psychrometer anemometer and hygrometer doppler radar and anemometer radiosonde and psychrometer