The Mariana Trench or Marianas Trench is the deepest part of the world’s oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islands. The trench is about 2,550 kilometres long but has an average width of only 69 kilometres (43 mi). It reaches a maximum-known depth of 10.994 km. The trench is not the part of the seafloor closest to the center of the Earth. This is because the Earth is not a perfect sphere: its radius is about 25 kilometres less at the poles than at the equator. As a result, parts of the Arctic Ocean seabed are at least 13 kilometres (8.1 mi) closer to the Earth’s center than the Challenger Deep seafloor.

Correct Option: D

The Mariana Trench or Marianas Trench is the deepest part of the world’s oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islands. The trench is about 2,550 kilometres long but has an average width of only 69 kilometres (43 mi). It reaches a maximum-known depth of 10.994 km. The trench is not the part of the seafloor closest to the center of the Earth. This is because the Earth is not a perfect sphere: its radius is about 25 kilometres less at the poles than at the equator. As a result, parts of the Arctic Ocean seabed are at least 13 kilometres (8.1 mi) closer to the Earth’s center than the Challenger Deep seafloor.

The Channel Tunnel is a 50.5-kilometre (undersea rail tunnel linking Folkestone, Kent, in the United Kingdom with Coquelles, Pas-de-Calais, near Calais in northern France beneath the English Channel at the Strait of Dover. At its lowest point, it is 75 m (250 ft) deep. At 37.9 kilometres, the Channel Tunnel possesses the longest undersea portion of any tunnel in the world, although the Seikan Tunnel in Japan is both longer overall at 53.85 kilometres.

Correct Option: D

The Channel Tunnel is a 50.5-kilometre (undersea rail tunnel linking Folkestone, Kent, in the United Kingdom with Coquelles, Pas-de-Calais, near Calais in northern France beneath the English Channel at the Strait of Dover. At its lowest point, it is 75 m (250 ft) deep. At 37.9 kilometres, the Channel Tunnel possesses the longest undersea portion of any tunnel in the world, although the Seikan Tunnel in Japan is both longer overall at 53.85 kilometres.

The term ground zero describes the point on the Earth’s surface closest to a detonation. In the case of an explosion above the ground, ground zero refers to the point on the ground directly below the detonation. The World Trade Center site, previously known as “Ground Zero” after the September 11 attacks, sits on 16 acres in Lower Manhattan in New York City. The previous World Trade Center complex stood on the site until it was destroyed in the September 11 attacks; Studio Daniel Libeskind, the Port Authority of New York and New Jersey, Silverstein Properties, and the Lower Manhattan Development Corporation oversee the reconstruction of the site.

Correct Option: B

The term ground zero describes the point on the Earth’s surface closest to a detonation. In the case of an explosion above the ground, ground zero refers to the point on the ground directly below the detonation. The World Trade Center site, previously known as “Ground Zero” after the September 11 attacks, sits on 16 acres in Lower Manhattan in New York City. The previous World Trade Center complex stood on the site until it was destroyed in the September 11 attacks; Studio Daniel Libeskind, the Port Authority of New York and New Jersey, Silverstein Properties, and the Lower Manhattan Development Corporation oversee the reconstruction of the site.

The Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona. It is contained within and managed by Grand Canyon National Park, the Hualapai Tribal Nation, and the Havasupai Tribe. Nearly two billion years of the Earth’s geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While the specific geologic processes and timing that formed the Grand Canyon are the subject of debate by geologists, recent evidence suggests the Colorado River established its course through the canyon at least 17 million years ago.

Correct Option: A

The Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona. It is contained within and managed by Grand Canyon National Park, the Hualapai Tribal Nation, and the Havasupai Tribe. Nearly two billion years of the Earth’s geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While the specific geologic processes and timing that formed the Grand Canyon are the subject of debate by geologists, recent evidence suggests the Colorado River established its course through the canyon at least 17 million years ago.

A dike or dyke in geology is a type of sheet intrusion referring to any geologic body that cuts discordantly across: planar wall rock structures, such as bedding or foliation; and massive rock formations, like igneous/ magmatic intrusions and salt diapirs. Today, approximately 27 percent of the Netherlands is actually below sea level. This area is home to over 60 percent of the country’s population of 15.8 million people. The Netherlands, which is approximately the size of the U.S. states Connecticut and Massachusetts combined, has an approximate average elevation of 11 meters. With the help of dikes, the Netherlands (also known as Holland) was able to reclaim land for settlement and also control flooding.

Correct Option: B

A dike or dyke in geology is a type of sheet intrusion referring to any geologic body that cuts discordantly across: planar wall rock structures, such as bedding or foliation; and massive rock formations, like igneous/ magmatic intrusions and salt diapirs. Today, approximately 27 percent of the Netherlands is actually below sea level. This area is home to over 60 percent of the country’s population of 15.8 million people. The Netherlands, which is approximately the size of the U.S. states Connecticut and Massachusetts combined, has an approximate average elevation of 11 meters. With the help of dikes, the Netherlands (also known as Holland) was able to reclaim land for settlement and also control flooding.