A ... is (high) than a ..., I (can/can't) climb it
A mountain is higher than a hill, I can climb it
A ... is (hot) than a ..., I (can/can't) stay there long
A jungle is hotter than a forest, I can't stay there long
A ... is (long) than a ..., I (can/can't) swim in it
A river is longer than a lake, I can swim in it