How does the structure of the vascular bundles in stems and roots and of the veins in leaves make the process of pressure-flow possible?

Monocots

1. Embryo has single cotyledon

2. Flower parts in multiples of threes

3.Major leaf veins are parallel.

4. Roots are adventitious

5. Stem vascular bundles scattered

6. Pollen with single furrow or pore.

7. Secondary growth absent.

Dicots

1. Embryo with two cotyledon

2. Flower parts are in multiples of four or five.

3. Major leaf veins reticulated.

4. Roots develop from radicle.

5. Stem vascular bundles are in a ring.

 6. Pollen with three furrows or pores.

7. Secondary growth often present.

it cools slower in the earth meaning the crystals have more time to form than lava on the surface