What are the two things that might be found at the site of an excavation

In which of these cases are the two wave points considered to be in phase with each other?

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Define dew point. i am writing this part to be able to ask the question