Question

The type of weathering that affects heterogeneous rocks is : A) chemical weathering B) granular disintegration C) exfoliation D) biological weathering

Answer 1

Answer:

biolojical weathering

Answer 2

Answer:

Impact of rock composition on weathering in heterogeneous and homogeneous grain boundary models. (a) Weathering rate in R* units versus composition; (b) ratio of mechanical weathering to total weathering as a function of composition; and (c) the number of detachment events versus composition. The heterogeneous model assumes that the reactivity for each grain boundary is dependent on the type of the adjacent minerals, while in the homogeneous model all boundaries have the same reactivity.

Context 1

... addition to the existing model in which the grain boundaries reacted at a rate that was dependent on its mineral phase (which we define here as the heterogeneous model), we constructed an alternative model in which all the grain boundaries reacted at the same rate (defined as the homogeneous model). A comparison of the two kinds of simulations shows that weathering rate of rocks with homogeneous grain boundaries is almost constant, regardless of the mineral composition 20 (Figure 7a). This is due to higher density of reactive grain boundaries (relative to the heterogeneous model) that enhances the contribution of mechanical weathering to the overall rate (Figure 7b). ...

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Context 2

... comparison of the two kinds of simulations shows that weathering rate of rocks with homogeneous grain boundaries is almost constant, regardless of the mineral composition 20 (Figure 7a). This is due to higher density of reactive grain boundaries (relative to the heterogeneous model) that enhances the contribution of mechanical weathering to the overall rate (Figure 7b). The proportion of grain detachment in the homogeneous model shows a linear increase with increasing proportion of low reactivity minerals, reaching a maximum value of 86%. ...

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Context 3

... is a result of the rapid dissolution of highly reactive grain boundaries 25 which promotes grain detachment, and effectively compensates for the increasing presence of low reactivity minerals. In addition, the homogeneous model also shows a dramatic decrease in the number of detachment events with increasing proportion of the low reactivity phase (Figure 7c). This reflects the transition from the detachment of tiny sub-grains to the detachment of large complete grains. ...

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