11.2 Exploring Mountain Formation and Impact

Front

Which type of plate boundary is primarily responsible for the formation of mountain ranges like the Himalayas?

Back

Convergent boundary

Answer explanation

The Himalayas were formed primarily by the collision of the Indian and Eurasian tectonic plates at a convergent boundary, where two plates push against each other, leading to the uplift of mountain ranges.

Front

Type of mountain formed by the upwarping of Earth's crust.

Back

Dome mountains

Answer explanation

Dome mountains are formed by the upwarping of Earth's crust, creating a rounded, uplifted structure. This distinguishes them from fold mountains, fault-block mountains, and volcanic mountains, which have different formation processes.

Front

Explain how the process of orogenesis contributes to mountain building.

Back

It is the process of mountain formation through tectonic forces.

Answer explanation

Orogenesis is the process of mountain formation through tectonic forces, such as the collision of tectonic plates, which leads to the uplift and creation of mountain ranges.

Front

What is a horst in geological terms?

Back

A raised block of the Earth's crust bordered by faults.

Answer explanation

A horst is defined as a raised block of the Earth's crust that is bordered by faults. This distinguishes it from a graben, which is a sunken block. Therefore, the correct choice is 'A raised block of the Earth's crust bordered by faults.'

Front

What is a graben, and how does it form?

Back

A sunken block of the Earth's crust bordered by parallel faults.

Answer explanation

A graben is a sunken block of the Earth's crust that forms when tectonic forces pull apart the crust, creating parallel faults. This results in the land between the faults sinking down.

Front

Example of a fold mountain: The Andes, The Sierra Nevada, The Black Hills, The Hawaiian Islands

Back

The Andes

Answer explanation

The Andes are a prime example of fold mountains, formed by the collision of tectonic plates. In contrast, the Sierra Nevada and Black Hills are not classified as fold mountains, and the Hawaiian Islands are volcanic in origin.

Front

How does mountain building impact biodiversity in a region?

Back

It increases biodiversity by creating diverse habitats.

Answer explanation

Mountain building increases biodiversity by creating diverse habitats. The varied elevations and climates lead to different ecosystems, allowing a wider range of species to thrive compared to more uniform landscapes.

Front

What is the primary difference between an anticline and a syncline?

Back

Anticlines are upward-arching folds, while synclines are downward-arching folds.

Answer explanation

The primary difference is that anticlines are upward-arching folds of rock layers, while synclines are downward-arching folds. This distinction is key in understanding geological structures.

Front

Describe the role of plate tectonics in the geological time scale.

Back

Plate tectonics influences the distribution of continents and oceans over time.

Answer explanation

Plate tectonics plays a crucial role in shaping the Earth's surface by influencing the movement of continents and oceans over geological time, which affects climate, habitats, and the distribution of life.

Front

Which process is primarily responsible for the formation of fault-block mountains?

Back

Tensional forces

Answer explanation

Fault-block mountains are primarily formed by tensional forces, which pull the Earth's crust apart, causing blocks of crust to drop or rise. This process creates the characteristic steep slopes of fault-block mountains.