MS-ESS3-1: Earth's Resource Formation

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Glacier Noun

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[GLAY-sher]

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Glacier

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A large, persistent body of dense ice that is constantly moving under its own weight.

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Example: The image shows how snow transforms into glacial ice, with stages labeled and air content decreasing, explaining glacier formation.

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Glacial Period Noun

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[GLAY-shul PEER-ee-ud]

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Glacial Period

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A colder interval of time within an ice age marked by colder temperatures and glacier advances.

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Example: The graph shows glacial periods as low points in global temperature over 500,000 years.

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Interglacial Period Noun

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[in-ter-GLAY-shul PEER-ee-ud]

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Interglacial Period

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A geological interval of warmer global average temperature lasting thousands of years that separates consecutive glacial periods.

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Example: The graph shows how Earth's temperature changes, with interglacial periods being warmer times between colder glacial periods.

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Ice Sheet Noun

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[EYES sheet]

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Ice Sheet

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A massive layer of ice covering an extensive area of land for a long period of time.

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Example: The image shows an ice sheet with labels for ice flow, ice shelf, and grounding line, explaining how ice sheets cover land.

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Glacier Advance Noun

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[GLAY-sher ad-VANS]

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Glacier Advance

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The forward movement of a glacier's edge, occurring when more snow accumulates than melts.

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Example: The image shows glacier advance with arrows for snow accumulation and melting, explaining forward movement.

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Glacier Retreat Noun

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[GLAY-sher ree-TREET]

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Glacier Retreat

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The process of a glacier's edge melting back faster than it moves forward.

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Example: The image shows a glacier, but it needs labels to explain how the glacier is retreating.

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Glacial Till Noun

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[GLAY-shul TIL]

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Glacial Till

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Poorly sorted sediment, including rocks and boulders, deposited directly by a melting glacier.

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Example: Glacial till is shown as sediment deposited by a melting glacier, with labels for snow, plucking, and meltwater.

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Erratic Boulder Noun

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[eh-RAT-ik BOHL-der]

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Erratic Boulder

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A large rock transported and deposited by a glacier, often differing from the local bedrock.

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Example: A large boulder deposited by a glacier, different from surrounding rocks.

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Moraine Noun

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[muh-RAIN]

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Moraine

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A mass of rocks and sediment carried and deposited by a glacier, often forming ridges.

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Example: The image shows how glaciers carry and deposit rocks to form different types of moraines.

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Terminal Moraine Noun

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[TUR-min-ul muh-RAIN]

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Terminal Moraine

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A moraine deposited at the furthest point of a glacier's advance.

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Example: The image shows a terminal moraine formed at the glacier's furthest point, with labels for clarity.