Quarter 2 - The Asteroids (Grade 8).pptx

It will cover the different types of asteroids

1. ASTEROIDS Prepared by: Aira Mae D. Dela Cruz -Practice Teacher-

2. CLASSROOM REMINDERS Sit properly. If you want to answer, just raise your hands. Do not answer in chorus. Avoid chatting with your seatmates during class discussion. Avoid using cellphone during class discussion, unless it is needed.

3. LET’S REVIEW! 1. How many days does an Earth have in a year? 365 Earth days and 366 days if Leap year. 2. What do you call when a planet spins around its axis? Rotation 3. What do you call when a planet spins around another object? Revolution

4. GUESS THE WORDS!

5. S R E C E C E R E S

6. A H S T E N A T H E N S

7. T N R S O A J T R O J A N S

8. A O L P O S L A P O L L O S

9. ACTIVITY TIME!

10. ASTEROIDS Small rocky or metallic body that orbits the Sun. They are generally irregular in shape and often have surfaces covered with craters. Asteroids range in size from a few meters to over 500 km.

11. Iron and Nickel are the asteroid’s components, the same metal that make up the Earth’s core. Alvarez Hypothesis An element called Iridium was discovered on oceanic sedimentary layers of Denmark, Italy, and New Zealand, by Alvarez Brothers namely Luis and Walter Alvarez. An asteroid with about ten kilometers in diameter made an impact on Earth. This phenomenon caused the blocking of sunlight in the air, bringing a period of long winter that caused the mass extinction of plants and animals including dinosaurs. ASTEROIDS

12. Where are they found? Asteroids are found in the MAIN ASTEROID BELT between Mars and Jupiter. Astronomer Johan Bode discovered the existence of asteroid in the year 1800. Their number is estimated to be about 30,000 but only 7,000 have been identified. A relatively higher silicate content caused these celestial body to reflect light.

13. FAMOUS ASTEROIDS Ceres is the largest asteroid. (940 km in diameter) It was discovered by Guiseppe Piazzi on January 1, 1801.

14. FAMOUS ASTEROIDS Pallas is the Second Largest Asteroid (540 km in diameter) Vesta is the Third Largest Asteroid (510 km in diameter)

15. Types of Asteroids (according to color and composition) C-Type Asteroids – very dark and carbonaceous. There are 75 percent of known asteroids that are the C-Type. Ceres is the most famous C-type asteroid. Explored by the Dawn spacecraft from 2014 to 2018.

16. S-type Asteroids – rusty red in color and are composed of iron and magnesium silicate. 3 Juno is one of the S-Type asteroid. Types of Asteroids (according to color and composition)

17. M-type Asteroid rich with metallic substances. 216 Kleopatra , a dog-bone-shaped asteroid is classified as M-type asteroid . Types of Asteroids (according to color and composition) Types of Asteroids (according to color and composition)

18. 1. Athens – lie near the orbit of Mars (ex: Ceres, Pallas, Juno, and Vesta ) 2. Apollos – lie near Jupiter. (ex: Eros, Geographos , Icarus) 3. Trojans – lie within the main asteroid belt. (ex: Hector, Diomedes , Agamemmon , and Petrocious ) Types of Asteroids (according to position)

19. ELABORATE

20. What will happen when an asteroid hits the Earth ? When an asteroid hits the Earth surface it will cause a destructive impact on the ground and may also cause the extinction of the living organisms on the area.

21. QUESTIONS What is asteroid ? Where does asteroids found ?

22. He was the astronomer who discovered the existence of asteroid in the year 1800 . How many asteroids have been identified? QUESTIONS

23. Give one possible effect of asteroid when it hits the Earth surface. QUESTIONS

24. QUIZ TIME!

25. QUESTION What is an Asteroid Belt ? a. It has rocks crossing the Sun, Mars, and Jupiter. b. It has rocks crossing the Sun, Jupiter, and Uranus. c. It is an area between Mars and Jupiter where most asteroids are found. d. It has rocks between the Earth and Jupiter where most asteroids are found. QUESTION

26. QUESTION 2. He was the astronomer who discovered the existence of asteroid in the year 1800 a. Johan Bode b. Albert Einstein c. Luis Pasteur d. William Alvarez

27. QUESTION 3. It is the largest asteroid a. Juno b. 216 Kleopatra c. Ceres d. Icarus

28. QUESTION 4. Who discovered the Asteroid Ceres? a. Guiseppe Piazzi b. Johan Bode c. Walter Alvarez d. Ivan Ivanovsky

29. QUESTION 5. The word asteroid derived from the Greek words “ astor ” which means? a. like b. shape c. size d. star QUESTION

30. QUESTION 6. The word asteroid derived from the Greek word “ oid ” which means? a. like b. shape c. size d. star

31. QUESTION 7. It is the Second Largest Asteroid with 540 km in diameter? a. Pallas b. Vesta c. Juno d. 216 Kleopatra

32. QUESTION 8. It is the Third Largest Asteroid with 510 km in diameter? a. Pallas b. Vesta c. Juno d. 216 Kleopatra

33. QUESTION 9. An asteroid with a dog-bone-shaped. a. Pallas b. Vesta c. Juno d. 216 Kleopatra

34. QUESTION 10. A type of asteroid with a rusty red in color and are composed of iron and magnesium silicate. a. S-Type asteroid b. M-Type asteroid c. C-Type asteroid d. Athens

35. ALWAYS REMEMBER! *DO YOUR BEST IN EVERYTHING YOU DO.* *ALWAYS BE KIND TO EVERYONE*