NCES.8.P.1.3 Compare physical changes such as size, shape and state to chemical changes that are the result of a chemical reaction to include changes in temperature, color, formation of a gas or precipitate.
NCES.8.E.1.3 Predict the safety and potability of water supplies in North Carolina based on physical and biological factors, including:
Nitrates and phosphates
NCES.8.E.1.4 Conclude that the good health of humans requires:
Monitoring of the hydrosphere
Water quality standards
Methods of water treatment
Maintaining safe water quality
NCES.8.E.2 Understand the history of Earth and its life forms based on evidence of change recorded in fossil records and landforms.
NCES.8.E.2.1 Infer the age of Earth and relative age of rocks and fossils from index fossils and ordering of rock layers (relative dating and radioactive dating).
NCES.8.E.2.2 Explain the use of fossils, ice cores, composition of sedimentary rocks, faults, and igneous rock formations found in rock layers as evidence of the history of the Earth and its changing life forms.