Scientists were monitoring a meteor headed toward earth. it moved off course, but some pieces of rock entered the earth’s atmosphere. which atmospheric layer protected the earth against the danger of the rocks?
the troposphere
the stratosphere
the mesosphere
the thermosphere

Mesosphere

The atmospheric layer that protects the Earth against danger of the rocks is the mesosphere. This layer is above the stratosphere. The temperature drops in this layer to about -100 degrees Celsius. This is the coldest region of the atmosphere. The mesosphere burns up most meteors and asteroids before they are able to reach the earth's surface. It becomes cold enough to freeze water vapor in its atmosphere into ice clouds.

the mesosphere  

Explanation:

The mesosphere is the lowest layer of the stratosphere and coldest layer of atmosphere. The incoming meteors and debris from the space are burned away in this layer. As the debris passes the layers of the atmosphere, the friction causes them to burn and destroy before these reach the surface thereby protecting the Earth's surface. On the bodies like mercury and moon, we can find the surface has many impact craters. This is because there is no atmosphere on mercury and moon which could protect their surfaces.

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question