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Which of the following is the primary factor influencing global temperature variations?

• Ocean currents

• Latitude

• Friction

• Geostrophic balance

Answer explanation

🔹 Why? The closer a place is to the equator, the more direct sunlight it receives, making it hotter. The poles get sunlight at an angle, spreading the heat over a larger area, making them colder.
🔹 Example: Cities near the equator like Singapore are warm all year, while places near the poles like Alaska are much colder.

What is the main difference between oceanic and continental climates?

• Continental climates are milder due to water’s high heat capacity

• Oceanic climates experience greater temperature extremes

• Continental climates have more extreme temperatures due to land’s low heat capacity

• Oceanic climates are drier than continental climates

Answer explanation

🔹 Why? Land heats up and cools down quickly, while the ocean takes longer to change temperature.
🔹 Example: A city far from the ocean like Moscow, Russia, has very hot summers and freezing winters, while a coastal city like London, UK, has mild temperatures year-round.

How do prevailing winds affect global temperature distribution?

• They transport warm and cold air masses across regions

• They always move from east to west

• They decrease the impact of the Coriolis force

• They reduce the effect of ocean currents

Answer explanation

🔹 Why? Winds move air from warm areas to cold areas and vice versa, affecting climate.
🔹 Example: The westerlies bring warm air to Europe from the Atlantic Ocean, making winters milder compared to other places at the same latitude.

What are gyres in ocean circulation?

• Large, circular ocean current systems caused by the Coriolis force

• Sudden oceanic temperature changes

• Wind patterns that move perpendicular to pressure gradients

• Air pressure differences between oceanic and continental regions

Answer explanation

🔹 Why? The rotation of the Earth creates circular movements in the ocean.
🔹 Example: The North Atlantic Gyre moves warm water from the tropics to Europe and then brings cold water back to the tropics.

What drives the pressure gradient force?

• The difference in air pressure between two locations

• The Coriolis force acting on the ocean

• The movement of ocean currents

• The rotation of the Earth

Answer explanation

🔹 Why? Air moves from high-pressure areas to low-pressure areas, creating wind.
🔹 Example: A balloon pops because the high-pressure air inside rushes to the low-pressure air outside.

How does air pressure change with altitude?

• Air pressure increases with altitude

• Air pressure decreases with altitude

• Air pressure remains constant

• Air pressure fluctuates randomly

Answer explanation

🔹 Why? There is less air pushing down as you go higher up.
🔹 Example: When climbing a mountain, your ears "pop" because air pressure is lower at the top.

What does the Coriolis force do to moving air in the Northern Hemisphere?

• Deflects it to the left

• Deflects it to the right

• Stops its movement

• Increases air pressure

Answer explanation

🔹 Why? The rotation of the Earth causes moving air to turn instead of moving in a straight line.
🔹 Example: Hurricanes in the Northern Hemisphere spin counterclockwise because of this effect.

Geostrophic balance occurs when which two forces are in equilibrium?

• Pressure gradient force and Coriolis force

• Air pressure and ocean currents

• Friction and centrifugal force

• Geostrophic wind and stable atmospheric conditions

Answer explanation

🔹 Why? The pressure difference moves air, and the Coriolis force deflects it, creating balanced winds.
🔹 Example: The jet stream is a geostrophic wind that moves high above the Earth.

What is a geostrophic wind?

• Wind that moves perpendicular to the Coriolis force

• Wind that results from the balance between the pressure gradient force and Coriolis force

• Wind that is unaffected by Earth's rotation

• Wind that only exists in tropical regions

Answer explanation

🔹 Why? When air moves due to pressure differences but is also affected by the Earth’s rotation, it forms steady, strong winds at high altitudes.
🔹 Example: The strong winds that airplanes use to travel faster across continents.

Which of the following best describes centrifugal force in atmospheric motion?

• A force that pulls air towards the equator

• A force that causes objects to move in a curved path due to rotation

• A force that increases with altitude

• A force that reduces friction in the atmosphere

Answer explanation

🔹 Why? When something moves in a circle, it tries to move outward due to inertia.
🔹 Example: When you spin a bucket of water quickly, the water stays in even when the bucket is upside down.