Newton's Laws of gravity explain what the gravitational relationship between any two bodies will be. The law of abiogenisis explains (without equations, just like evolution) where life comes from (prior life). I know that one is not a favorite of some these days, but it remains "invariably true under a certain set of conditions". The laws of thermodynamics are explanatory. I am not quite getting why you think laws are not explanatory. Websters Dictionary says otherwise.