Earth Science: Weather & Climate

Which layer of the atmosphere contains the majority of the Earth's air mass and is characterized by a decrease in temperature with increasing altitude?

The troposphere, which extends from the surface to approximately 12 km and contains about 75-80% of the atmosphere's mass.

In the Northern Hemisphere, which direction does the Coriolis effect deflect moving air parcels?

To the right of their intended path of motion.

What meteorological instrument is used to measure wind speed by utilizing the rotation of cups or a propeller?

An anemometer.

Which cloud type is characterized by its massive vertical extent, anvil-shaped top, and association with heavy precipitation and thunderstorms?

Cumulonimbus clouds.

What are the lines on a weather map that connect points of equal atmospheric pressure called?

Isobars.

What is the most abundant gas in Earth's atmosphere by volume?

Nitrogen (N2), making up approximately 78% of the dry atmosphere.

Explain why the temperature increases with altitude in the stratosphere.

The temperature increase is caused by the absorption of ultraviolet (UV) radiation by the ozone layer, which converts solar energy into heat.

Describe the formation of an occluded front.

An occluded front forms when a fast-moving cold front overtakes a slower-moving warm front, lifting the warm air mass completely off the ground.

What is the geostrophic wind, and what two forces must be in balance for it to occur?

The geostrophic wind is a theoretical wind that blows parallel to isobars; it occurs when the Pressure Gradient Force (PGF) is exactly balanced by the Coriolis Force.

Define the Dry Adiabatic Lapse Rate (DALR) and provide its approximate value.

The DALR is the rate at which an unsaturated air parcel cools as it rises or warms as it sinks, approximately 10°C per 1,000 meters (or 1°C per 100m).