Sediments derived primarily from the products of weathering on the continents are called a. terrigenous sediment b. biogenous sediment c. hydrogenous sediment

Option A, Terrigenous sediment

Explanation:

Terrigenous sediments are formed by weathering of rocks on land especially the ones that are exposed to land. These rocks are transported by rivers, winds and even ice. The deposition of these sediments is limited to the continental shelf.  

While biogenous sediment are made up of non soluble remains of dead life forms on the planet and hydrogenous sediments are formed by exchange of ion /precipitation between the ocean water and sediments.  

Thus, it can be said that  terrigenous sediment are derived from products of weathering on the continents

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.