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3 August, 13:03

1. Rocks found in a river bed would typically be what type of rocks?

Sedimentary

Metamorphic

Igneous

Lava

2. Parasitism is when

one organism benefits from another without it being affected

both organisms benefit from a relationship

one organism feeds off another making it weak or killing it

both organisms are hurt from a relationship

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  1. 3 August, 16:16
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    Igneous or metamorphic. Depending on the energy of the river, they could be anything from large, rounded cobbles or pebbles (as per classification of the Udden-Wentworth Scale), or sand and gravel as identified under other systems. Or angular clasts that haven't been rounded by moving along the bed. Note that the Udden-Wentworth is usually applied to sedimentary features, but can also be used in classifying the * size * of any rock.
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