Earth's Heat & Endogenic Processes

The heat __________ from the crust down to the inner core due to several reasons. Which of the following words will best complete the thought of the given statement?

• decreases

• equals

• increases

• proportioanl

All the layers of the earth have its own properties and characteristics. Which among the layers of the earth has the highest temperature?

• core

• crust

• lithosphere

• mantle

Different elements comprise the layers of the earth. Which layer of the earth has the highest amount of molten state iron?

• core

• crust

• lithosphere

• mantle

Why is Earth considered as a thermal engine?  

• The main source of internal energy is the sun.

• The moon gives energy to earth and convert it to thermal energy.

• The pressure of the materials in the crust causes materials to be molten.

• The main source of heat comes from the produced decay of some naturally occurring isotopes from its interior.

What happened to the amount of heat from crust down to the core?

• It is equal. 

• It becomes lower.

• It becomes higher.

• It is indirectly proportional.

Earth was formed about 4. 6 billion years ago. Which of the following pertains to the process by which gasses and dust of cloud were attracted by gravitational energy?

• Accretion 

• Solidification

• Gravitational pull

• Planetesimal

It is not possible to know about the earth’s interior by direct observations because of its huge size and the changing nature of its internal composition. Which of the following will best describe the given sentence?

• It is correct.

• It is incorrect.

• It depends upon the outer or inner core.

• It cannot be determined due to the nature of Earth.

Which among the layers of the earth has the greatest pressure which causes tremendous internal heat of the earth?

• crust

• mantle

• outer core

• inner core

There are several sources that contribute to the internal heat of the earth. Which of the following is NOT a major process that contributed to Earth’s internal heat?

• heat from radioactivity of radioactive isotopes within the Earth’s core

• heat released by colliding particles during the formation of the planet

• heat released as iron crystallized to form the inner core

• heat from the sun since the beginning of Earth history

How did the Earth generate heat on its early stage of formation?

• by radioactive decay 

• by gravitational pressure 

• by absorption of solar energy

• by collision of the masses of gas and dust