Which skin layer holds layers together

What happens to the atomic radius when an elctron is lost

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?