Which statement is an example of how living things play a role in physical weathering? Wind carries grains of sand and dirt that hit the surface of a rock.

Water from a waterfall beats against the rocks at its base, breaking them apart.

Tree roots climb into cracks in rocks, causing pressure that splits the rocks as the roots grow.

Water that has seeped into a rock expands as it freezes, pushing out every tiny crevice it has dripped into.

How has china attempted to increase its gdp since the end of the 20th

Let the sample size of leg strengths be 7 and the sample mean and sample standard deviation be 945 watts and 48 watts, respectively. (a) is there evidence that leg strength exceeds 900 watts at significance level 0.05? find the p-value. there is , evidence that the leg strength exceeds 900 watts at ? -0.05. 0.001 < p-value 0.005 0.05 p-value < 0.10 0.10 p-value < 0.25 o 0.010 p-value 0.025 (b) compute the power of the test if the true strength is 915 watts. (c) what sample size would be required to detect a true mean of 915 watts if the power of the test should be at least 0.9? n= exact number, no tolerance

In the 1830s which mountain man encouraged americans to move to california with stories of its rich soil warm sun and friendly people a) joseph walker b) joseph smith c) jedidiah smith d) james beckwourth