(6) Matter and energy. The student knows that matter has physical and chemical properties and can undergo physical and chemical changes. The student is expected to
 distinguish between physical and chemical changes in matter.
(8) Earth and space. The student knows that natural events and human activity can impact Earth systems. The student is expected to:
(A) predict and describe how catastrophic events such as floods, hurricanes, or tornadoes impact ecosystems;
(B) analyze the effects of weathering, erosion, and deposition on the environment in ecoregions of Texas; and
(C) model the effects of human activity on groundwater and surface water in a watershed.