Ice samples from glaciers provide evidence that today's atmosphere contains more carbon dioxide than ancient atmospheres on Earth did. Why is this increase in carbon dioxide a concern to scientists? A. It contributes to the rapid expansion of continental glaciers.
B. It contributes to the rapid cooling of the warm ocean currents.
C. It contributes to the gradual warming of the atmosphere.
D. It contributes to the loss of radiant energy from the Sun.​

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.