A Mountain pass is a route through a mountain range or over a ridge. Since many of the world's mountain ranges have presented formidable barriers to travel, passes have been important since before recorded history, and have played a key role in trade, war, and migration.

Correct Option: D

A Mountain pass is a route through a mountain range or over a ridge. Since many of the world's mountain ranges have presented formidable barriers to travel, passes have been important since before recorded history, and have played a key role in trade, war, and migration.

Despite rapid advances in earth sciences and technology, it is hard to predict the exact timing of an earthquake. The suddenness associated with earthquakes is the main reason behind severe damage to life and property. Due to the general unpredictability of earthquakes, it is best to stress the importance of planning ahead.

Correct Option: A

Despite rapid advances in earth sciences and technology, it is hard to predict the exact timing of an earthquake. The suddenness associated with earthquakes is the main reason behind severe damage to life and property. Due to the general unpredictability of earthquakes, it is best to stress the importance of planning ahead.

Geologically, a fjord is a long, narrow inlet with steep sides or cliffs, created in a valley carved by glacial activity. A fjord is formed when a glacier cuts a U-shaped valley by ice segregation and abrasion of the surrounding bedrock.

Correct Option: D

Geologically, a fjord is a long, narrow inlet with steep sides or cliffs, created in a valley carved by glacial activity. A fjord is formed when a glacier cuts a U-shaped valley by ice segregation and abrasion of the surrounding bedrock.

Youthful rivers or streams are typically found in the highland or mountainous areas. They are characterized by steep slopes, a relatively small volume of water and rapid flow. Soil particles carried by youthful streams flow along the ground, wearing down hill slopes as the water flows down. In this youthful stage of the river, such features as small lakes, waterfalls, rapids, V-shaped valleys, gorges and interlocking spurs are frequently found.

Correct Option: B

Youthful rivers or streams are typically found in the highland or mountainous areas. They are characterized by steep slopes, a relatively small volume of water and rapid flow. Soil particles carried by youthful streams flow along the ground, wearing down hill slopes as the water flows down. In this youthful stage of the river, such features as small lakes, waterfalls, rapids, V-shaped valleys, gorges and interlocking spurs are frequently found.

Greenwich Mean Time (GMT) is a time system originally referring to mean solar time at the Royal Observatory in Greenwich, London, which later became adopted as a global time standard. It is the term in common use in the United Kingdom and countries of the Commonwealth, including Australia, South Africa, India, Pakistan and Malaysia, as well as many other countries in the Old World.

Correct Option: B

Greenwich Mean Time (GMT) is a time system originally referring to mean solar time at the Royal Observatory in Greenwich, London, which later became adopted as a global time standard. It is the term in common use in the United Kingdom and countries of the Commonwealth, including Australia, South Africa, India, Pakistan and Malaysia, as well as many other countries in the Old World.