7th Grade Science - Home - Hart County Schools

(19) Types of air masses: Tropical: warm; low pressure. Polar: cold; high pressure. Maritime: air mass that occurs over oceans. Continental: air mass that occurs over land (20) Types of Storms: thunderstorms, tornados, etc. (21) Techniques to observe geological time: Radioactive dating: using half-lives of unstable substances to date. Rock ... ................
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