Which statement does not refer to radiation? Some of this energy is reflected off Earth's atmosphere. Land and ocean absorb and re-emit heat from the sun. Warm air rises and takes heat with it; eventually it cools and sinks. Sunlight travels through space without the aid of fluids or solids.

warm air rises and takes heat with it eventually it cools and sinks

Explanation:

There are three modes of heat transfer:

1. Conduction: This type of heat transfer happens when there is direct contact between the two objects.

2.  Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) in which convection currents are produced due to the movement of hot fluid upwards and cold fluid downwards. This happens as the density of hot fluid decreases and thus it moves upwards.

3. Radiation: This type of heat transfer happens when there is direct transfer of energy through space.

Warm air rises and takes heat with it eventually it cools and sinks  is an example of convection and not radiation.

since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.

hello,

the steamboat is your answer.

it seems like its the only form of transportation on the choices.