Science is 2 things. describe what those 2 things are

The three types is stress that act on earths rocks are compression, tension, and

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy

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?