an experiment is carried out to determine how different pH values of soil will affect the growth of tomato plants in this experiment the development variable could be the

its the tomato

the pH is what is going to effect the growth of tomatoes the higher pH levels should effect it the most possibly even kill it while the regular soil should not effect it to much.

Explanation:

i was thinking 4.0 v hope this

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.