I think it's the first one and the third one. Not completely sure though.
Answer:
The answer is A) more, older than.
Explanation:
It says that the rocky mountains are older and that Shenandoah National Park have undergone more erosion in the passage.
Cancer isn’t infectious nor is heart disease. Infectious diseases are things spread my bacteria or organisms.
When magma<span> cools, </span>crystals<span> form because the solution is super-saturated with respect to some </span>minerals<span>. If the </span>magma<span> cools quickly, the </span>crystals<span> do not have much time to form, so they are very small. If the </span>magma<span> cools slowly, then the </span>crystals<span> have enough time to grow and become large.</span>
