Accretion Theory (Origin of the Planet Earth)

Question 1

What is the process of accretion?

Answer 1

The accumulation of small pieces of dust forms huge lumps of matter.

Question 2

What is accretion based on astrology?

Answer 2

Gravity attracts tiny bits of matter toward an object. This
results in a gradual increase in the object’s size.

Question 3

In relation to the solar system formation, the objects increase its size until it turn into planets and stars. This is because of the?

Answer 3

GRAVITATIONAL PULL

Question 4

A protoplanet is a planetary embryo that consists of
collection of matter, from which a planet is formed.

Answer 4

TRUE!

Question 5

What are the two hypotheses on how the structure of Earth was formed that both involve accretion?

Answer 5

HOMOGENEOUS ACCRETION HYPOTHESIS
HETEROGENEOUS ACCRETION HYPOTHESIS

Question 6

What does the homogeneous accretion hypothesis state?

Answer 6

This states that the formation of Earth began AFTER!!!!!!!! the condensation of fine particles of the primitive nebula is about 4.6 billion years ago.

Question 7

HOMO

When these particles accreted, they formed a HOMOGENEOUS primordial Earth. Thus, early Earth had a uniform ____ composition.

Answer 7

UNIFORM SOLID

Question 8

HOMO

What were the primary components of the early Earth?

Answer 8

iron, magnesium, nickel, and silicates

radioactive elements: uranium and thorium

Question 9

HOMO

Due to gravitational contraction and decay of radioactive
elements, the temperature of early Earth increased.

Answer 9

TRUE

Question 10

HOMO

What elements melted that sank to the center and became the primary elements that compose the Earth’s core?

Answer 10

Iron and Nickel

Question 11

HOMO

Less dense silicates were displaced and moved upwards.

Answer 11

TRUE

Question 12

HOMO

It took many years for iron and nickel to accumulate and reach
the center of about 4000 miles deep.

Answer 12

TRUE

Question 13

HOMO

Earth’s surface experienced turmoil, violent earthquakes, continual volcanic eruptions, and covering of the surface with flowing lava during the accumulation of iron and nickel.

Answer 13

TRUE

Question 14

HOMO

After the cooling down of the early Earth, a thin layer of solid rock formed the ____, including the continental and ocean basins.

Answer 14

CRUST

Question 15

HOMO

In between the core and crust is the mantle. What is the mantle made out of?

Answer 15

Semi-molten silicate rocks and other minerals.

Question 16

What does the heterogeneous accretion hypothesis state?

Answer 16

This states that the core has formed at the same time as Earth. Therefore, early Earth had its basic layered structure with a core, mantle, and crust.

Earth accreted DURING!!!!!!!!!!!!!!!!!!! condensation, forming a differentiated planet as it grew in size.

Question 17

HETERO

As the nebula cooled down, its particles have condensed
depending on their condensation points.

Answer 17

TRUE

Question 18

Oxides of ALUMINUM and CALCIUM condensed first, followed by IRON and NICKEL.

Answer 18

ALuminum Calcium = ALUC -> ALOK
Iron Nickel = Ibigay ng Nanay

ALUC muna bago Ibigay ng Nanay

Question 19

Oxides of ALUMINUM and CALCIUM condensed first, followed by IRON and NICKEL. When the nebula cooled further, the
SILICATES condensed.

1. Aluminum and Calcium
2. Iron and Nickel
3. Silicates

Answer 19

TRUE

ALuminum Calcium = ALUC -> ALOK
Iron Nickel = Ibigay ng Nanay
Silicates = Saya Siya

ALoC muna bago Ibigay ng Nanay kaya Saya Siya

Question 20

The CORE was developed by accretion of
Aluminum and Calcium Oxide, followed by Iron
and Nickel

Answer 20

TRUEG

ALoC muna bago Ibigay ng Nanay

Question 21

The outermost layer is composed of ______, as
well as volatile particles including _____.

Answer 21

SILICATES, WATER

Question 22

Who is the proponent of the Accretion Theory?

Answer 22

Otto Yulyevich Schmidt

Question 23

SEQUENCES OF EVOLUTIONARY EVENTS IN ACCRETION THEORY ARE THE? (5)

Answer 23

Collapsing of molecular cloud
formation of the protoplanetary Disk
growth of Planetesimals
beginning to Orbit the central star
growth of protoplanet Earth

C D P O P