CAS ES 142 Midterm: Beaches and Shores Exam 3
30 Jul 2018
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Document Summary
Glaciated coasts: contain sand and gravel deposits. Mid-atlantic: rivers delivered sand to the coast. Florida: warmer water is more conducive to creatures living in the nearshore; creatures have shells. Sand and shells rivers and organisms(shells increase from north to south) Northern river - bedload sand produced by physical weathering. Southern rivers - suspended load mud due to chemical weathering. Polyps: have a symbiotic relationship with zooxanthellae (blue-green algae) Hermatypic corals contain zooxanthellae and are reef-producing. Intense heat in tropics produces extreme evaporation rates. Calcium carbonate is precipitated in concentric shells around a nucleus. Type of tree or large bush that grows in salt water. Much of the root structure is above water; pneumataphores and prop roots. Part of a sandy beach that becomes rock. Salt spray or storm waves wet upper beach sand with salt water. High evaporation leads to caco3 cementing sand grains. Time 1: storm waves/salt spray infiltrates upper beach, water.
