<u>Answer:
</u>
The build-up of three oxygen created our ozone layer around two billion years ago.
<u>Explanation:
</u>
- The ozone layer is a part of the stratosphere which is located right after the troposphere in the atmosphere of the Earth.
- The ozone gas is made up of the abundance of three oxygen molecules combining with the ultraviolet radiation emitted by the Sun.
- The development of the ozone layer happened around two billion years ago when the oxygen concentration levels on the planet began to rise slowly and gradually.
It keeps us from flying into outerspace.
Answer:
Called "the mother of the civil rights movement," Rosa Parks invigorated the struggle for racial equality when she refused to give up her bus seat to a white man in Montgomery, Alabama. Parks' arrest on December 1, 1955 launched the Montgomery Bus Boycott by 17,000 black citizens.
<u>Answer</u>:
When Uranium-238 decays, it emits 8 Alpha particles and 6 beta particles before finally becoming the stable daughter product. The atomic number and mass number of the daughter product is 92 and 234 respectively.
<u>Explanation</u>:
In the process of decay of Uranium-238, it emits alpha particles, and the resultant product is Thorium-234, which turns into Protactinium-234, and this Protactinium-234 undergoes the beta decay to form the Uranium-234.
As per the question, a stable daughter product is created after the emission of alpha and beta particles, this implies that Uranium-234 is a stable product after the decay of Uranium-238. Therefore, the atomic number is 92 (number of protons) and the mass number is 234 (protons+neutrons) which is also the element of the naming.
Answer:
The cirrus, cumulonimbus, altostratus, nimbostratus clouds are all assiciated with a warm front.
Therefore all the given options are correct.
Explanation:
The <u>weather fronts</u> can result in the formation of clouds. A front occurs when the two large mass of air collides on the surface of earth.
Warm fronts results in the cloud formation when warm air slides above and replace the cold air. The different types of clouds that can be formed by warm fronts are: <u>altostratus</u>, altocumulus, cirrocumulus, <u>cirrus</u>, cirrostratus, <u>cumulonimbus, nimbostratus</u>, stratus and stratocumulus.
Therefore, cirrus, cumulonimbus, altostratus, nimbostratus clouds are all assiciated with a warm front.
