Answer: ACID
Explanation:on the Ph scale their is acids and bass' the loewer the Ph is hte higher the acid will be
 
        
             
        
        
        

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The answer to this will be is : </h3><h2 /><h2>
C. Plant roots grow into a crack in a rock.</h2><h2 /><h2>

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Because "mechanical weathering" It's a example of the Plants roots that grow on into a crack in the rock.
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Answer:
<em>1. They effect crop productivity</em>
As weeds start to grow in the area where the crops were destined to grow, the production of the crops gets lowered.
<em>2. They deplete the crops from nutrition</em>
The weeds will compete with the crop plants for resources such as minerals from the soil.
<em>3. They will deplete water resources</em>
The weeds will compete with the crop plants for water.
<em>4. Sun-light will be depleted</em>
The weeds will complete with the crop plants for sun light.
<em>5. The crop quality will be affected</em>
As the crop plants will be in competition with the weeds, hence their quality will be affected.
6.  <em>They can reduce the biodiversity of crop plants.</em>
 
        
             
        
        
        
It's called a tectonic shift.
These plates are always shifting, and they can either grind in opposite directions, pull away from one another, or collide to create a fault-line.