Assertion: avalanche | /r/HasProperty | noted on slope
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Source sentences:
text: Slope angle is important as most avalanches occur on slopes between 25 and 400C, although avalanches have been noted on slopes as gentle as 150C and as steep as 60oC. Snow pack conditions is a significant factor as the layers below the upper snow can not be seen and it is difficult to assess whether the slope is likely to fail.