Need help on question 25,26,27. Physical geography

Physical Geography Lab Test # 2Name25 . Orographic Lifting occurs becausea ) Air rises as it warmsb ) An air mass rises above a mountainC ) Advection moves an air mass over landd ) Advection moves an air mass inland from the oceane ) Advection moves an air mass over a mountain26 . What is the difference between Relief and Slope ?a ) Relief is the elevation , Slope is a ratiob ) Relief is the horizontal distance Slope is a ratio( ) Slope is the horizontal distance . Relief is the elevation1 ) Slope is the elevation , Relief is the horizontal distancee ) None of the above27 . A Cold Front is different from a Warm Front in thata ) Cold air is sinking and says close to the groundb ) Warm air is moving forward and forces the colder air upw( ) Cold air does not moved ) Warm air does not movee ) None of the aboveupR