Question

Which rock consists mostly of pieces of seashell? A. sandstone c. pumice B. coquina D. granite Use the diagram below to answer questions 7-9.

Short answer

The correct answer is B. coquina.

Step-by-step solution

Understanding the Question

The question asks us to identify which type of rock is primarily composed of seashell fragments. We are provided with four options: sandstone, pumice, coquina, and granite.

Analyzing Rock Types

To answer the question, we need to know the composition of each rock type. Sandstone is primarily composed of sand-sized mineral or rock grains. Pumice is a light volcanic rock with a frothy texture. Granite is a dense, igneous rock composed mainly of quartz, feldspar, and mica. Coquina is a sedimentary rock, specifically composed of shell fragments.

Identifying the Correct Rock

Among the given options, coquina is known to be made up largely of shell fragments, making it the correct choice.

Key concepts

Coquina

Coquina is a fascinating type of sedimentary rock that primarily consists of shell fragments. These shells are typically derived from marine organisms, such as clams and other bivalves, which accumulate over time in shallow coastal waters. This accumulation happens through natural processes, where waves and currents deposit solid materials along the shoreline.
Coquina is usually soft, porous, and varies in color from white to a light yellowish hue. Its name derives from the Spanish word for "shellfish." This rock can be an excellent indicator of a particular environment, often pointing to a historical coastline or shallow marine setting where ancient seas once existed.
Its formation not only offers insight into past geological conditions but also showcases the remarkable transformation that biological materials undergo to become part of the Earth's crust. Coquina is primarily used in construction or as a decorative stone due to its unique appearance and historical significance.

Rock Composition

Understanding the composition of rocks is essential to identifying and using them effectively. When analyzing rock types, one must consider the minerals and materials they are made of.
For example, coquina is predominantly composed of shell fragments, which clearly sets it apart from other rocks like sandstone or granite.

• Sandstone consists primarily of sand-sized particles like quartz.
• Pumice is characterized by its light, frothy texture due to volcanic activity.
• Granite is composed of minerals such as quartz, feldspar, and mica.

These components determine not only the rock's texture and color but also its durability and appropriate use in various applications.
Internal composition can also reveal a rock's formation environment, guiding us to understand past geological conditions and predict how similar materials might behave under different circumstances.
Knowledge of rock composition is a fundamental aspect of earth science, helping researchers separate natural phenomena and uncover Earth's history.

Earth Science Education

Earth science education plays a crucial role in our understanding of the planet and its processes. Learning about rock types and compositions helps students appreciate the intricate ways Earth supports life and evolves over time.
By studying rocks like coquina, students can learn about sedimentary processes and the environments in which these rocks form. This knowledge enhances awareness of ecological and geological history, highlighting the interactions between Earth's physical geography and living organisms.
Earth science educators use a variety of teaching tools and methods, including hands-on rock samples, diagrams, and field trips, to engage students. These approaches aim to make earth science an exciting, relatable subject that informs students about natural resources, environmental challenges, and the importance of sustainable practices.
Overall, a robust earth science education fosters curiosity, critical thinking, and a lifelong appreciation for the natural world.