How does water enter the atmosphere?
a.
liquid water evaporates from lakes when heated by the sun.
b.
frozen water sublimates from ice and snow.
c.
liquid water is lost from tree leaves during evapotranspiration.
d.
all of the above.

The correct answer is D) All of the above.

The movement of water from the surface of the earth to the atmosphere and vice versa is called the water cycle. It involves the changing of the states of water as it is moves from bodies of land, water, and the atmosphere.

The stages of the water cycle include the entry of water into the atmosphere by:

Once the atmosphere becomes saturated with water, water is returned to the surface of the earth through precipitation or as rain or snow. This water may be evaporated again later on or may flow through or sink to the ground and find its way to bodies of water or be taken up by roots of plants where they might undergo evaporation, transpiration, or sublimation once again.

Keywords: water cycle, atmosphere

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.