Which items are used as types of models? check all that apply.

diagrams
illustrations
observations
reports
structures

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?

Why was lebanons civil war in 1975 worse than the civil war in 1958?