Chapter 28 - Astronomy

Question 0

A nuclear reaction in which two atomic nuclei combine is called

Answer 0

Fusion

Question 1

According to Einstein’s theory of relativity, in the formula E=mc2, the c stands for

Answer 1

The speed of light

Question 2

The portion of the sun in which energy moves from atom to atom in the form of waves is called the

Answer 2

Radioactive Zone

Question 3

The portion of the sun normally visible from the earth is the

Answer 3

Photosphere

Question 4

The sunspot cycle lasts

Answer 4

11 years

Question 5

Sudden outward eruptions of electrically charged particles from the sun are called

Answer 5

Solar flares

Question 6

Gusts of solar wind can cause

Answer 6

Magnetic storms

Question 7

Northern lights and southern lights are other names for

Answer 7

Auroras

Question 8

The hypothesis that the sun and the planets developed out of the same cloud of gas and dust is called the

Answer 8

Nebular theory

Question 9

The small bodies of matter that filled the solar nebula are called

Answer 9

Planetesimals

Question 10

Compared with the size of the present day planets, the protoplanets were

Answer 10

Larger

Question 11

The first atmosphere of the earth had a high percentage of

Answer 11

Helium

Question 12

In the process of photosynthesis, Cyanobacteria and green plants give off

Answer 12

Oxygen

Question 13

Water vapour began to condense into oceans about

Answer 13

3 billion to 3.5 billion years ago