1. Why does radioactive decay play a very important role in earth's internal heat? A. Radioactive element can be found anywhere in the planet. B. When radioactive element decays, it produces heat. C. Spontaneous nuclear disintegration of radioactive elements produced thermal energy. D. All of the above 2. How does the conduction in the surface of the earth affect the temperature of our atmosphere? A. Air molecules come in contact with the warmer surface of the land and ocean resulting to the increase of its thermal energy. B. Air molecules come in contact with the cooler surface of the land and ocean resulting to the decrease of its thermal energy. C. Air molecules does not come in contact with the warmer surface of the land and ocean resulting to the increase of its thermal energy. D. Air molecules do not come in contact with the cooler surface of the land and ocean resulting to the increase of its thermal energy. 3. How does convection in Earth's mantle affects the formation of landmass like volcano and mountain? A. Heat tries to escape in the interior of the earth. B. Collision and separation of tectonic plates happens due to the slow motion of convection cells. C. When warm material in the mantle rises up to the surface (ground), it will cool and sinks, these cooled materials will eventually be turned into landmass. D. All of the above 4. What is produced by the radioactive decay of isotopes in the mantle and crust? A. radiogenic heat B. primordial heat C. superheating D. heat from the sun 5. This refers to the heat left over from the formation of the Earth? A. radiogenic heat B. primordial heat C. superheating D. heat from the sun

2.) B - EXPLAINATION Conduction directly affects air temperature only a few centimeters into the atmosphere. During the day, sunlight heats the ground, which in turn heats the air directly above it via conduction. At night, the ground cools and the heat flows from the warmer air directly above to the cooler ground via conduction

3.) C - EXPLAINATION Convection currents drive the movement of Earth's rigid tectonic plates in the planet's fluid molten mantle. In places where convection currents rise up towards the crust's surface, tectonic plates move away from each other in a process known as seafloor spreading (Fig.

4.) A - EXPLAINATION The radioactive decay of elements in the Earth's mantle and crust results in production of daughter isotopes and release of geoneutrinos and heat energy, or radiogenic heat.

5.) B - EXPLAINATION EARTH may have formed more than 4.5 billion years ago, but it's still cooling. ... The rest is primordial heat left over from when Earth first coalesced from a hot ball of gas, dust, and other materi