Earth Science

Earth is closest to the sun (perihelion) in early January, which corresponds to winter in the Northern Hemisphere. It is farthest from the sun (aphelion) in early July, during the Northern Hemisphere summer.

Ocean currents significantly influence long-term climate by affecting temperature and weather patterns globally, making 'major … patterns' the most accurate choice. The other options either use incorrect collocations or less precise terms.

Sunlight penetrates ocean water to a depth of about 200 meters, known as the euphotic or sunlit zone, where there is enough light for photosynthesis. While light intensity decreases rapidly with depth and varies with water clarity, the upper limit of sunlight penetration is generally around 200 meters, not 80 meters. The 80 meters figure may represent a typical depth for photosynthesis in some waters, but the euphotic zone extends deeper, up to about 200 meters in clear ocean water. Therefore, option B (200 meters) is the most accurate answer.

The Earth's lithosphere is the rigid outer layer that is divided into major tectonic plates. These plates move and interact, causing geological phenomena such as earthquakes and volcanic activity.

The term 'Cryosphere' refers to all the frozen water on Earth, including glaciers, ice caps, sea ice, and permafrost. This distinguishes it from the Hydrosphere (all water), Biosphere (all life), and Frigid Zone (a climatic region).

The 2005 Pakistan earthquake, also known as the Kashmir earthquake, had a magnitude of 7.6 on the Richter scale, making option B the correct answer.

Most major tsunamis are generated by shallow-focus earthquakes with hypocenters less than 30 km deep because shallow earthquakes displace the seafloor more effectively, triggering large water waves.

Most of the ozone in Earth's atmosphere is concentrated in the stratosphere, specifically in the ozone layer, which absorbs and scatters ultraviolet solar radiation.

A seismograph is an instrument designed to record earthquake waves, and the magnitude of these waves is measured on the Richter scale, which quantifies the size of earthquakes.

The Mariana Trench is the deepest known part of the Earth's oceans, reaching depths of about 11,000 meters (36,000 feet). It is more specific and accurate than the general term 'Trench'.