2.1.2 The Distribution of Earthquakes and Volcanoes

What is the Earth's outer layer called?

• Mantle

• Core

• Crust

• Tectonic plate

Answer explanation

The Earth's outer layer is called the Crust.

How thick can the Earth's crust be at its thickest point?

• About 5km

• About 60km

• About 30km

• About 100km

Answer explanation

The Earth's crust can be about 60km thick at its thickest point, making the correct answer choice about 60km.

Into how many large plates is the Earth's crust divided?

• 5 large plates

• 8 large plates

• 10 large plates

• 12 large plates

Answer explanation

The Earth's crust is divided into 8 large plates, which are constantly moving and interacting with each other, leading to geological phenomena like earthquakes and volcanic eruptions.

What are the two categories of plates that the Earth's crust is divided into?

• Northern and Southern

• Eastern and Western

• Oceanic and Continental

• Upper and Lower

Answer explanation

The Earth's crust is divided into Oceanic and Continental plates based on their composition and density.

What do oceanic plates underlay?

• Mountains

• Oceans

• Continents

• Deserts

Answer explanation

Oceanic plates underlay oceans, not mountains, continents, or deserts. These plates are part of the Earth's crust beneath the ocean.

What do continental plates support?

• Ocean floors

• Large landmasses

• Ice caps

• Atmospheric layers

Answer explanation

Continental plates support large landmasses, not ocean floors, ice caps, or atmospheric layers.

Where do earthquakes and volcanoes generally occur?

• In the center of tectonic plates

• At plate boundaries

• At random locations on the Earth's surface

• Only around the Pacific Ring of Fire

Answer explanation

Earthquakes and volcanoes generally occur at plate boundaries, where tectonic plates interact and create geological activity.

What does each dot on the map represent?

• A volcano

• A city

• An earthquake with a magnitude of 4 or over

• A tectonic plate

Answer explanation

Each dot on the map represents an earthquake with a magnitude of 4 or over, as indicated in the question.

High magnitude, low-frequency earthquakes occur at which type of plate boundaries?

• Destructive Plate Boundaries

• Conservative Plate Boundaries

• Transform Plate Boundaries

• All of the above

Answer explanation

High magnitude, low-frequency earthquakes occur at Destructive Plate Boundaries.

Low-magnitude, high-frequency earthquakes occur at which type of plate boundaries?

• Destructive Plate Boundaries

• Conservative or Transform Plate Boundaries

Answer explanation

Low-magnitude, high-frequency earthquakes occur at Conservative or Transform Plate Boundaries, making it the correct choice.