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...them, and this might have been one of the first things you spotted when taking a careful look at the photograph. These lines define sedimentary layers or strata, so we are dealing with sedimentary rocks. In the rocks forming most of the vertical cliff face, the layers are horizontal, whereas in the white rocks of the foreground the layers are inclined to the right. They are like a tilted stack of books. In this case the......

...careful consideration. A lower alpha level (e.g., 0.01) makes it harder to reject the null hypothesis, reducing the risk of false positives but potentially missing real effects. A higher alpha level (e.g., 0.10) makes it easier to reject the null hypothesis, potentially detecting more real effects but also increasing the risk of false positives. The significance level...

...Adults can use their own OpenLearn account to supervise under 13s on the course, and assisting with the experiments. You can read more in the OpenLearn FAQs...Week 1: Why does science need numbers?: 1.1 Water, water everywhere - NARRATOR 1 Bottled water is ubiquitous in our daily lives. Every year in the UK, we each consume some 70 litres of purchased bottled water,...