4. Students are designing an experiment to model the transfer of heat from the sun to the Earth. What must the students consider in their design to represent this form
of energy transfer?
A. The Sun is a ball of fire therefore the students must use fire to represent the heat
source.
B. Heat from the Sun travels through space therefore the students will need a vacuum
chamber to demonstrate this form of heat transfer.
C. Heat transfer from the Sun to the Earth requires the students to model convection
since the heat travels through our atmosphere.
D. Heat from the Sun travels to the Earth via conduction and convection as the Earth is
comprised of solids, liquids, and gases.

B. Heat from the Sun travels through space therefore the students will need a vacuum chamber to demonstrate this form of heat transfer.

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.