Question 6(multiple choice worth 3 points) (06.02 mc) according to the chart below, which planet contains the most hydrogen gas? image describing the composition of the terrestrial planets (mercury, venus, earth, and mars) and the gas giants (jupiter, saturn, uranus, and neptune) of our solar system. mercury is composed of 45 percent core, 50 percent mantle, and 5 percent surface crust. venus is composed of 15 percent inner core, 20 percent outer core, 60 percent mantle, and 5 percent surface crust. earth is composed of 5 percent inner core, 35 percent outer core, 55 percent mantle, and 5 percent surface crust. mars is composed of 50 percent inner core, 45 percent outer core, and 5 percent surface crust. jupiter is composed of 5 percent rock, 15 percent water, 60 percent metallic hydrogen, and 20 percent hydrogen gas. saturn is composed of 10 percent rock, 20 percent water, 30 percent metallic hydrogen, and 40 percent hydrogen gas. uranus is composed of 30 percent rock, 35 percent water, and 35 percent hydrogen. neptune is composed of 15 percent rock, 60 percent water, and 25 percent hydrogen gas. saturn jupiter venus earth

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

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