Most irregular shape galaxies are thought to form from a collision between two galaxies. Describe the amount of star collision that may occur and why the shape of the galaxy with change from a collision.

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Which entry is in the wrong position in the table?

Which of the following is not a potential result of deforestation?