The process that occurs when physical forces break rock into smaller pieces without changing the rock’s chemical composition is called a. differential weathering b. mechanical weathering c. erosional weathering d. chemical weathering

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse