Why does the charge of pH-dependent charge sites change with pH? How does this affect CEC? Explain in 2 or more sentences plus a hand-drawn diagram. You may draw on paper and take a photo or draw in your preferred app with a touchscreen and take a screenshot. Students with accommodations may use powerpoint (other apps need to be approved in advance). Use the “add file” or “insert image” buttons to upload diagrams. Screenshots of slides are not accepted.

Most of the H+ and Al3+ in soil are found in the soil solution.

Which type of mineral contains the most iron, magnesium and calcium on average?

Eluviation is accumulation of minerals and/or organic matter in an endopedon

Match the correct master horizon designations (e.g. A, E, etc.) in the blanks. Horizons may be used more than once or not at all. Horizons are not listed in order.

Soil of what texture will contain the most water at field capacity?

Transition metals (ex: Fe, Mn) are likely to be _______ when is high, and _______ when is low.

On a cold winter day, temperature ________ as soil depth increases.

Sedimentary rocks can contain sand, silt, clay, or even fossils

_______ parent materials are deposited by streams and well-sorted because Stoke’s Law states that as particle size increases, particles settle _______ (faster or slower?)