Atmospheric Sciences

The Earth has been hit by meteoroids numerous times, even in the last century. Consequences range from small craters to flattened forests to mass extinctions on a planetary scale. For more information, see links below.

The troposphere is where weather occurs and where most of Earth's atmospheric gases are found, supporting life by containing oxygen and providing the conditions for plant growth. The stratosphere contains the ozone layer which absorbs harmful ultraviolet radiation from the sun, protecting life on Earth from its damaging effects. Together, these two layers of the atmosphere play vital roles in supporting and maintaining Earth's ecological balance.

When skydiving, your body is also exposed to the same outside pressure as your head, so there is no significant pressure difference that would cause your head to explode. Additionally, our bodies are designed to adapt to pressure changes, and as long as the pressure change is gradual, there is no risk of your head exploding while skydiving.

As an OBGYN resident, typically I work 630am until between 5-6pm everyday. I am on call anywhere from 1-3 weekend days (not entire weekends) per month. first year call is a little heavier. we have block nights, so only weekend coverage is required for call after first year, otherwise you have no nighttime responsibility. VERY LIMITED SCUTWORK at our hospital. If anything, we are given more hands on experience than we can sometimes handle (multiple deliveries or surgeries at the same time). During first year, hours may very from rotation to rotation, but you are never there later than 5 or 6pm.

Our sky is blue DURING THE DAY because of two things:

1) sunlight is entering our atmosphere

2) our atmosphere is thick enough to preferentially scatter blue light.

If either (1) or (2) cease to be true, then the sky will NOT be blue.

As night "falls," the sky does not go instantly from blue to black. Instead, less and less of our Sun's light is available to scatter, and thus the sky goes slowly from blue to black.

It's the same way as you go higher and higher. There is no altitude at which there is simply no longer enough atmosphere to scatter enough sun light to give the sky a blue look. It is more the case that, as you go higher and higher, the sky becomes less and less blue -- just like at night "fall."

For SOME idea of how our sky changes, check out a video of a space shuttle launch.

Earth's secondary atmosphere most likely developed from volcanic activity and comet impacts, which released gases like water vapor, carbon dioxide, and nitrogen. These gases accumulated over time to form the atmosphere we have today.

The simplest answer is related to aerodynamics, and air pressure. When you open the door, the higher pressure air outside of the car naturally rushes in to equalize the lower pressure inside the car.

Also, when the door is shut, there is air everywhere right up against it. When you open the door, the air is displaced, or pushed, out of the way by the door. Since it has to move somewhere when it is pushed by the door, it wraps around the door to the lower pressure area created on the backside of the door as it moves and creates a place void of air on the other side.

To visualize this effect, you can do your own experiment. Fill a clear container with water. Then, put something flat down into the water vertically (standing up). Next, move the object sideways across the water, watching the edges. You should see the water wrapping around the edges, filling in behind the object. That is the same effect.

The snow just happens to be an innocent bystander that gets carried in by the moving air.

The third, and most obvious reason is...you forgot to clean the snow off of your car before you opened the door!

The toposphere is a part of the Earth's atmosphere located between the tropopause and the stratopause. It is characterized by stable temperatures and decreasing pressure with altitude. It plays a role in controlling the Earth's weather patterns and atmospheric circulation.

Pluto's atmosphere is mainly made of nitrogen, methane, and carbon monoxide, but is less than 25-millionths the density of Earth's. The gases exist mostly as frozen solids on the planet's frigid surface, and only thaw when the planet is closest to the Sun.

That is a process called 'red shift' it a process where light shifts towards the red part of the light spectrum.

This can happen over vast distances such as galaxies and also through dense air. When the sun sets the light is going through a lot more of the atmosphere than when it's midday so it will shift more as it sets.

Petroleum is not a mineral because it is an organic substance derived from the remains of ancient plants and animals, while minerals are inorganic compounds with a crystalline structure formed in nature. Petroleum is a complex mixture of hydrocarbons, whereas minerals are naturally occurring solid substances with a specific chemical composition.

Ozone is found both in the upper

atmosphere and at ground level.

The ozone occurring in the upper

atmosphere (10-30 miles above the

earth's surface) is considered good

ozone because it helps to block the

Sun's ultraviolet rays.

Ozone occurring near the Earth's

surface is considered bad because it is

made of pollutants resulting from car

emissions, aerosols, factories,

refineries, chemical plants and boilers.

A system in which neither matter nor enery enters or leaves is a closed system.

The Aurora Borealis is in the northen hemisphere at the north pole. However the Aurora Australis is in the southern hemisphere at the south pole. That is the only difference in them; they are both formed in the same way.

They are both polar lights. One is the Aurora Borealis, the northern lights and the Aurora Australis, the southern lights. They are on the different poles on the earth, other than that, they are the same.

Borealis is near the North Pole.

Australis is near the South pole.

The Aurora Borealis is at the north magnetic pole: the Aurora Australis is at the south magnetic pole. That's the only difference.

They are both really the same thing but are visible from different places in the world. The aurora borealis can be seen in Northern England and in Scotland sometime, normally in summer and spring. The aurora austalis can be seen from places like Australia and New Zealand. Another difference is that the aurora borealis are brighter that the aurora austalis

The process of liquid changing into a vapor is called evaporation. This occurs when the molecules of a liquid gain enough energy to break free from the liquid's surface and become a gas.

Energy is the ability to do work or produce heat. Radiations, such as electromagnetic waves or particles, are forms of energy that travel through space. While all radiation carries energy, not all energy is in the form of radiation.

Places along the equator receive more direct sunlight throughout the year, leading to higher temperatures. The angle of sunlight is more intense near the equator, causing more heat to be trapped at the Earth's surface. Additionally, the equator receives consistent solar radiation due to its position relative to the tilt of the Earth's axis, maintaining warm temperatures year-round.

The atmosphere is important for two main reasons. It is the air that you breathe so, no atmosphere, no breathing. The other reason is it protects you by burning up the meteoroids that could hit earth.

Natural uranium can only be made critical by graphite or heavy water, so it can be stored almost anywhere, but obviously as it is valuable it would be stored in secure premises and in good dry conditions. Enriched uranium as used in power reactors can be made critical by normal water so storage should be somewhere that has been made secure against flooding.

Highly enriched uranium needs special arrangements as it can become critical simply by having too much too close together, and storing this type of uranium must be supervised by those who know the risks and how to avoid them.

Pressure decreases with altitude because there are fewer air molecules pushing down on a surface as you move higher in the atmosphere. Temperature, on the other hand, can vary with altitude due to changes in the absorption and release of heat as air rises and falls. Overall, the decrease in pressure and temperature with altitude is due to the decreasing density of air as you move further away from the surface of the Earth.

The current oxygen concentration in the Earth's atmosphere has been relatively stable at around 21% for the past 300 million years. This level is maintained through processes like photosynthesis by plants and phytoplankton, which convert carbon dioxide into oxygen.