I witnessed dinosaurs come and go, I was liquid before I was solid, Mountains are just piles of me, Yet I fit in your palm so small. What am I?

Wears a tight cap and leaves a bold trace, But lose the lid, it dries up in disgrace

I grow on trees but I am not fruit.I have veins but no blood.I can fall without getting hurt. What am I?

Roses are red, green means go. I’ll never change, so some don’t know. Even if I’m hidden in thicket, Don’t ignore me, that’s the ticket!

I wipe away your past to clear the scene, A ghostly boundary, clinical and clean. I steal your identity, erasing every trace, To heal a wound or leave a hidden space. A thin, synthetic skin that feels no pain, I guard from sickness and wash out the stain. What am I ?