Continentality<span>, </span>a measure of the difference between continental and marine climates characterized by the increased range often peratures that occurs over land compared with water. This difference is a consequence of the much lower effective heat capacities of land surfaces as well as of their generally reduced evaporation rates.
Nitrogen (N), nonmetallic element of Group 15 [Va] of the periodic table. It is a colourless, odourless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter. Boiling point: −195.8 °C (−320.4 °F)
Atomic number: 7 has five electrons in its outer shell, so it is trivalent in most compounds. Nitrogen is important for plant growth and can be 'fixed' by lightning or added to soils in fertilisers. A colourless, odourless gas. Nitrogen is important to the chemical industry. It is used to make fertilisers, nitric acid, nylon, dyes and explosives.
Intrusive rocks<span> come from magma. They cool slowly deep in Earth's crust. When magma cools underground, the crust acts like a blanket, insulating it, keeping it warm longer. Because the magma cools slowly, </span>crystals<span> of different minerals have time to grow.
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Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has two related subfields: lithostratigraphy (lithologic stratigraphy) and biostratigraphy (biologic stratigraphy).
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