1. Which of the following best describes bedded gypsum and halite? a. Coal and peat b. Evaporites c. detrital sedimentary rocks 2. What ions do the first plagioclase feldspar to crystalize from a magma contains more than the plagioclase that crystalizes later a. K+ b. Mg2+ c. Al3+ d. Ca2+ e. Na+ 3. A large cross-bedded sandstone outcrop has grains that are rounded and the same size. What is it likely to be? a. ophilite suite b. ancient chemical sediment c. lahar d. ancient sand dune e. none of the above