Sedimentary Structures Quiz

What are fossils in sedimentary rocks?

• Imprints left by modern organisms

• Artificially created structures

• Preserved remains or traces of ancient organisms

• Minerals formed by weathering and erosion

What are the types of sedimentary structures?

• bedding, cross-bedding, ripple marks, mud cracks, fossils

• igneous, metamorphic, volcanic, plutonic, extrusive

• lithification, compaction, cementation, weathering, erosion

• stratification, graded bedding, concretions, conchoidal fractures, trace fossils

How is cross-bedding formed?

• By the movement of glaciers and ice sheets

• By volcanic activity and lava flow

• By erosion of sediment on the windward side of a dune or ripple

• By deposition of sediment at an angle on the lee side of a dune or ripple

What is graded bedding in sedimentary rocks?

• Graded bedding is the arrangement of sedimentary layers with no variation in particle size.

• Graded bedding is the arrangement of sedimentary layers in a graded manner, with coarser particles at the bottom and finer particles at the top.

• Graded bedding is the arrangement of sedimentary layers in a random manner, with no specific pattern.

• Graded bedding is the arrangement of sedimentary layers with finer particles at the bottom and coarser particles at the top.

What are ripple marks in sedimentary rocks?

• Wave-like patterns formed on the surface of the rock by the movement of water or wind.

• Fossils embedded in the rock.

• Mineral deposits on the surface of the rock.

• Cracks formed due to heat and pressure.

Which subtopic of sedimentary structures focuses on ancient organisms?

• geology

• paleontology

• fossils

• mineralogy

What is the main characteristic of cross-bedding?

• Horizontal layers of sediment

• Inclined layers of sediment

• Vertical layers of sediment

• Curved layers of sediment

What causes the formation of ripple marks?

• Wind or water movement over loose sediment

• Chemical reactions

• Gravity

• Volcanic activity

What is the process of sorting sediment particles by size called?

• filtration

• sedimentation

• dispersion

• aggregation

What is the purpose of studying sedimentary structures?

• To analyze the composition of the Earth's core.

• To study the behavior of earthquakes.

• To understand Earth's history and past environments.

• To learn about the formation of igneous rocks.