soil formation Crossword

the solid layer of rock beneath the soil
the loose weathered material on earth's surface in which plants can grow
dark-colored organic material in soil
a measure of how well soil supports plant growth
a range of values used to indicate how acidic or basic a substance is
rich, fertile soil that is made up about equal parts of clay, sand, and silt
crumby, topmost layer of soil made up clay and other minerals and humus
the layer of soil below topsoil that has less plant and animal matter than topsoil and contains mostly clay and other minerals
a layer of soil that differs in color and texture from the layers above or below it
an organism that break the remains of dead organisms into smaller pieces and digest them with chemicals