Demonstration of Learning - Grade 7 Science

A marine scientist is studying the layers of the ocean and how they interact with

each other. Which of the following best describes how the ocean's layers contribute to its role as a major component of Earth's systems?

• Only the surface layer of the ocean interacts with the atmosphere and affects global processes.

• The different layers create isolated environments that do not interact with each other.

• The layers allow for diverse habitats and influence global nutrient and energy cycles.

• All ocean layers have the same temperature, pressure, and light conditions.

How does this image of the Maldives archipelago demonstrate the complex relationship between ocean systems and human dependence on them for resources and protection?

• The islands appear isolated, showing they don't rely on ocean resources at all.

• The many small islands suggest an abundant land area, reducing dependence on the ocean.

• The coral reefs surrounding the islands provide both fishing grounds and natural barriers against storms and erosion.

• The dark blue areas indicate deep waters unsuitable for any human use or habitation.

A coastal town is considering building a new fishing port to boost its economy. The town council is debating how this project might affect their relationship with the ocean. Which of the following best describes the complex ways this town depends on ocean

systems and how the new port might affect these dependencies?

• A. The town only relies on the ocean for fishing, and the new port will increase fish

  populations.

• B. The ocean provides food and transportation, but the new port won't affect coastal

  protection or the local climate.

• C. The town depends on the ocean for food, transportation, and tourism, but these are

  unrelated to the ocean's role in climate regulation.

• D. The ocean provides resources, transportation, coastal protection, and climate

  regulation, all of which could be impacted by the new port's construction and increased

  activity.

Which of the following best describes the complex ways this town depends on ocean systems and how the new port might affect these dependencies?

• The town only relies on the ocean for fishing, and the new port will increase fish populations.

• The ocean provides food and transportation, but the new port won't affect coastal protection or the local climate.

• The town depends on the ocean for food, transportation, and tourism, but these are unrelated to the ocean's role in climate regulation.

• The ocean provides resources, transportation, coastal protection, and climate regulation, all of which could be impacted by the new port's construction and increased activity.

How can the restoration of oyster populations help reverse the environmental damage caused by human activities? (Select THREE answers.)

• Restored oyster reefs can trap sediments and reduce coastal erosion, improving coastal habitats.

• Oysters' ability to filter excess nutrients helps to restore water quality that has been degraded by agriculture runoff.

• Oyster restoration programs help reduce carbon dioxide levels in the atmosphere through the creation of oyster shells.

• The growth of oyster reefs enhances biodiversity by providing habitat for a variety of marine species.

• Oyster restoration increases water temperature, which promotes the growth of coral reefs in the area.

Ocean currents function as a major component of ocean systems. What is their importance in global processes?