I blossom like a flower, a hindrance I create, and save you from the earth, do not use me too late. What am I?
I can flow like a river, and come from dust, I age hard as iron, but never rust. What am I?
Concrete (liquid state before solidification).
I warm the heart and I chill the skin, I can take human form, but I may vanish into nothing, soon after I am born. What am I?
White eyes behind, red eyes ahead, but if I am not hasty, white turns to red
A car on a motorway ('Eyes' = headlights and tail lights).