Which one of the following is not a cause of mechanical or physical weathering? abrasion by wind and water, plants, frost wedging, oxidation

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Why is carbon ideal for making different compounds?

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?