Earth Sci for DOST PART 1

• Triassic Period is the appearance of the first Dinosaurs and Mammals.
• Jurassic Period is the Age of Dinosaurs
• Soil profile is composed of a series of horizons/ layers stacked one on top of the other.
• The soil surface layer is called A horizon or Topsoil
• B horizon is also known as subsoil, it contains more clay than sand and silt.
• C horizon is made up of unweathered parent material that has not been altered by weathering processes.
• B horizon is also known as subsoil, it contains more clay than sand and silt
• R horizon is bedrock
• C horizon is made up of unaltered parent material
• O horizon is organic matter such as leaves, twigs, grasses, etc.
• A horizon is rich in humus (organic matter)
• B horizon is poorer in humus but richer in minerals
• C horizon is the layer below B horizon that has not been altered by weathering processes
• The A Horizon is the soil layer in which seed germination takes place.
• Seed Germination is the process where new roots are produced which grows into a new plant.
• E Horizon is composed of nutrients leached from the O and A Horizons.
• B Horizon is more harder and compact than topsoil.
• C Horizon is made up of broken bedrock.
• R Horizon is a compacted and cemented layer.
• R Horizon is home of different types of rocks such as granite, basalt, and limestone.
• O Horizon is known as the Organic Layer
• A Horizon is also known as Topsoil
• E Horizon is known as Eluviation Layer
• B Horizon is known as Subsoil
• C Horizon is known as Saprolite
• R Horizon is known as Bedrock layer (Well di ko sure bsta ganon)