Correct Answer: option
B: <span> helium and hydrogen
Reason:
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The nebular hypothesis is the most widely accepted theory that explains the formation and evolution of the Solar System. It was proposed by I. Kant. According to this theory, Solar System formed from nebulous material. Further, according to the nebular hypothesis, stars form the massive and dense clouds of molecular hydrogen.
Answer:
D.
Explanation:
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<u>Full question:</u>
When energy is changed from one form to another, some of the energy is lost to the surroundings as waste thermal energy. The more steps needed to arrive at the desired energy or the more types of energy that are generated, the more energy is wasted.
Which object would likely have the least amount of wasted energy?
A) an electric drill
B) a solar cell
C) a car engine
D) a hydroelectric dam
Solar cell
<u>Explanation:</u>
In an electric drill, the conversion of electrical energy into mechanical energy takes place. Heat energy is obtained when the desired object gets broken with the drill.
In car engine, thermal energy is obtained from the chemical energy which in turn is converted into mechanical energy which is very essential for moving car.
In hydroelectric dam, energy is obtained from water that is stored in dam. The potential energy of water is transformed into mechanical energy which in turn is converted into kinetic energy which again is transformed into an electrical energy.
In the above methods the transformation of energy takes many steps wherein more amount of energy gets wasted.
In Solar cell, the energy that is obtained from the sun is directly converted into electrical energy. Hence, in solar cell, only less amount of energy will be wasted.
Answer:
Think of the many ways that the hydrosphere and the atmosphere connect. Evaporation from the hydrosphere provides the medium for cloud and rain formation in the atmosphere. The atmosphere brings back rainwater to the hydrosphere.
In what way do the geosphere and hydrosphere connect? Water provides the moisture and medium for weathering and erosion of rocks on in the geosphere. The geosphere, in turn, provides the platform for ice melts and water bodies to flow back into the oceans.
The atmosphere provides the geosphere with heat and energy needed for rock breakdown and erosion. The geosphere, in turn, reflects the sun's energy back into the atmosphere.
The biosphere receives gases, heat, and sunlight (energy) from the atmosphere. It receives water from the hydrosphere and a living medium from the geosphere.
Think of the many ways in which each sphere interacts with the other and discuss it with your class.
