Earth Science

Earth Science

​Quarter 2 - Module 2

Earth's Internal Heat Sources​

​

by JOEFREY FLORES

​MELC:

​Explain why the Earth's interior is hot.

​

​Objectives:

​1. Identify the sources of the internal heat of the Earth; and

​2.explain the process of the production of internal heat of Earth

​ In January 12, 2020, Taal Volcano woke up from its long sleep and spew tons of gases and ashes that covered the surrounding municipalities in Batangas including the neighboring provinces of Cavite and Laguna. After the intense phreatic explosion, PHIVOLCS reported that there was a magmatic explosion on the following day.

Open Ended

Where does the magma come from?

Open Ended

How does internal structure of Earth produce magma?

Open Ended

What can you infer on the Earth's internal temperature?

​ Earth's Internal Heat Source

​

Earth was formed about 4.6 billion years ago and continue to serve as habitat to diverse organisms. Its biotic components remain alive due to proper regulation of internal heat. It has massive amount that varies from its layer.

​1. Primordial heat of the planet remains from its early stage. The Earth was formed from the process of accretion wherein gasses and dust of clouds was attracted by gravitational energy. When these masses compacted it formed planetesimals. In the process, due to the collision of these masses, heat was generated.

​2. Heat from the decay of radioactive elements

​ Earth is considered as thermal engine since its main source of internal heat come from the produced decay of some naturally occurring isotopes from its interior. This process is known as radioactive decay by which the spontaneous breakdown of an atomic nucleus causes the release of energy and matter from the nucleus.

​

This process of radioactive decay which emits heat energy as one of the products prevents the Earth from completely cooling off.

​3. Gravitational pressure

​ The more a person descend into Earth's interior, the amount of pressure increases due to the force pressing on an area caused by the weight of an overlying rocks. The pressure near the center is considered to be 3 to 4 million times the pressure of atmosphere at sea level.

​4. Dense core material in the center of the planet. Due to increase in pressure and presence of heavier materials towards the earth's center, the density of earth's layers also increases.

​

​

​Pls watch the video

Multiple Choice

As you move from the surface of Earth to the inner core, what happens to the temperature?

• A. It increase

• B. It decrease

• C. it stays the same

• D. It increases, then decreases

Multiple Choice

As you move from the surface of Earth to the inner core, what happens to the density of the materials of each layer?

• A.Density increases

• B.Density decreases

• C.Density stays the same

• D. Density increases, then decreases

Multiple Choice

Why do some isotopes play a minor role in the production of heat in the interior of the earth?

• A. Due to the heat it releases

• B.Due to chemical stability

• C. Due to its high energy capacity

• D. Due to its abundance in the core

Multiple Choice

Heat flows from the different layers to the earth. What type of heat transport occurs between the mantle and the core?

• A. Conduction

• B. Convection

• C. Radiation

• D.Sublimation

Multiple Choice

Which of the following pertains to the spontaneous breakdown of an atomic nucleus resulting in the release of energy and matter from the nucleus?

• A. Convection

• B. Gravitational pressure

• C. Radiation

• D.Radioactive decay

Multiple Choice

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

• A. By radioactive decay

• B. By gravitational pressure

• C. By absorption of solar energy

• D. By collision of the masses of gas and dust

Multiple Choice

Which of the following sentences in incorrect?

• A.As someone goes down the center of the earth, the pressure increases, thus, the temperature increases.

• B. As someone goes down the center of the Earth, the density of the materials increases, thus, the temperature increases.

• C. Due to radiactive decay in the center of the earth, the planet is cooling off.

• D.There are remains of primordial heat of the Earth.

Multiple Choice

The heat escaping from the core also makes material move around in different layers of the planet. Which of the following will best describe the given sentence?

• A.It is true

• B. It is false

• C. It depends upon the layer of the earth.

• D.It cannot be determined due to the composition of Earth.

Multiple Choice

How do radioactive isotopes emit heat energy and contribute to Earth's internal heat?

• A.By pressure freesing

• B.By gravitational pressure

• C.By preserving the primordial heat

• D. By spontaneous radioactive decay

Multiple Choice

Which of the following is the main source of Earth's internal heat?

• A.Primordial heat

• B.Radioactive elements

• C.Gravitational pressure

• D. Dense core material

​Additional Enrichment Activity

​ Watch the ETULay video found in your earth science google classroom and the the recorded video for those students who are absent during online session. Read your printed module and answer the posttest found in google classroom.

​ Do not forget to have one screenshot during watching online video tutorial, one screenshot during reading your module and one screenshot for those students who are watching video recorded specially those students who are absent in the live discussion. Send all of these to my messenger. In sending the pictures, don't forget to write your name or you can upload your screenshots/photos in the google classroom if you know how to upload your photos/screenshots.

​References

​

​DepEd Self Learning Module

​DepEd Video

​DepEd ETULay

​Recorded video

​THANKS!