Rocks and Soil

Layer of the soil rich in humus

• topsoil
• subsoil
• parent material
• bedrock

Layer of soil which is poor in humus but mineral rich and lighter is the

• topsoil
• subsoil
• parent material
• bedrock

Soil containing the remains of dead and decaying organic matter is called

• organic
• humus
• loam
• sandy

Gradual wearing away or removal of soil by water, wind, humans or natural processes

• weathering
• erosion
• metamorphosis
• fermentation

Rocks formed by solidification and deposition of small particles are called

• igneous
• sedimentary
• metamorphic
• lava rock

Process where rock is broken down into smaller pieces is called

• erosion
• weathering
• faulting
• earthquake

A naturally formed solid made of one or more minerals is a _____________.

• mineral
• rock
• soil
• clay

A solid inorganic material of natural occurrence which rocks contain is called

• mineral
• opal
• pumice
• lava rock

Color left behind by a mineral when it is rubbed against a rough white tile is called ___________.

• streak
• luster
• metallic
• hardness

Layer of soil that has not weathered yet

• topsoil
• subsoil
• parent material
• bedrock