Presentation on theme: "Boardworks High School Science The Atmosphere"— Presentation transcript:
1 Boardworks High School Science The Atmosphere thermospheremesosphere
2 The Atmosphere Mixture of gases that surround Earth There are 4 layers in the atmosphere that are divided based on their temperature gradient.troposphere,stratospheremesosphere,thermosphere
3 4 Layers1) Troposphere – layer in which we live; Weather phenomena (clouds) occur here.It’s elevation ranges from 0 to 10 km2) Stratosphere – above troposphere; temperatures increase with altitude.This layer contains the ozone layer, which protects us from harmful sunlight
4 What are the layers in the atmosphere? (cont…) Mesosphere – coldest layer of atmosphereThermosphere – uppermost layer; temperatures also increases with altitude.This is where most small meteorites burn upthe location in the atmosphere that the northern lights occur (aurora borealis)
5 Structure of the Atmosphere ThermosphereMesosphereOzone MaximumStratosphereTroposphereTemperature
6 Why is the atmosphere important? Boardworks High School ScienceThe AtmosphereThe Earth is different than the other planets in our solar system because it has an atmosphere that can support life.thermosphereThe atmosphere is an envelope of different gases (air) surrounding Earth.mesosphere80% of atmospheric gases are in the 15 km closest to Earth. This is a very thin layer compared to the Earth’s diameter, which is 12,756 kilometers.
7 What is the atmosphere made of? Boardworks High School ScienceThe AtmosphereThe gases that make up the atmosphere are:the remaining 1% is mostly argon (0.93%) with some carbon dioxide (0.035%), varying amounts of water vapor andtrace amountsof other gasesabout 21% is oxygenabout 78% is nitrogen
8 Does Earth’s atmosphere change? Boardworks High School ScienceThe AtmosphereThe current composition of the air has been roughly the same for nearly 200 million years, but the amounts of different gases have changed over time.About 3.5 billion years ago, the atmosphere on Earth would have been similar to the atmosphere on Mars today.It would have contained large quantities of carbon dioxide, but not much oxygen or nitrogen.Photo credit: NASAThe image shows the appearance of Mars in February It was created using a composite of images from the Mars Global Surveyor (MGS), the Mars Orbiter Camera (MOC) and daily global images taken in February 2005.What theories are used to explain how the Earth’s atmosphere changed?
9 The history of the atmosphere Boardworks High School ScienceThe AtmosphereTeacher notesThis timeline can be used to introduce work on the Earth’s atmosphere and to help convey a sense of the timescale involved.
10 Boardworks High School Science The Atmosphere Evolving atmosphereBoardworks High School ScienceThe Atmosphere