4. To be considered a fossil an
organism must have lived only during a short
part of Earth's history; many fossils of the
organism must be found in rock layers; the
fossil must be found over a wide area of
Earth; the organism must be unique.

weathering is the answer.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.