I believe the answer is Volcanic glass
Answer:
<em>A seedling is a small plant with few leaves that is vulnerable to the elements. Eventually the seedling changes into a young adult plant. At this stage, the plant is bigger and may have more leaves. Thin branches will develop on young adult trees.</em>
Explanation:
<em>Hope</em><em> It</em><em> Help</em>
Answer: D
Explanation: Because I looked it up in an article for you. Also I already learned this