BELLRINGER The reproductive success of an organism depends in part on the ability of

the organism to survive. How does the physical appearance of these

organisms help them survive?

0%

0%

0%

0% 1. Their physical appearance helps them find a habitat.

2. Their physical appearance helps them resist parasites.

3. Their physical appearance helps them avoid predators.

4. Their physical appearance helps them defend a territory.

Astronomy

Chapter 26.1

The Sun

I. The Sun

A. Corona

1. Outer atmosphere

2. Invisible

B. Chromosphere

C. Photosphere

1. Visible

D. Convective Zone

1. Hot gases rise

2. Cool gas sinks

E. Radiative Zone

F. Core

1. Energy production

2. 15,000,000 ºC (27,000,000 ºF)

Page 43 – figure 9

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conve

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coro

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core

.

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The sun's energy is produced in

the

1. radiative zone.

2. convective zone.

3. corona.

4. core.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

chro

mosp

here

photo

spher

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coro

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The ____ is a region of the sun where

hot and cooler gases circulate in

convection currents.

1. chromosphere

2. photosphere

3. corona

4. convective zone

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21 22 23 24 25 26 27 28 29 30

chro

mosp

here

coro

na

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The ____ is a thin, red region of the sun just

below the corona which is too faint to see

unless there is a total solar eclipse.

1. chromosphere

2. corona

3. radiative zone

4. convective zone

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II. Energy Production A. Nuclear fusion

1. E = mc2

a. E = energy

b. m = mass

c. c = speed of light

2. Two or more nuclei join

a. Releases energy

III. Fusion in the Sun

A. Two hydrogen = deuterium

B. Hydrogen + deuterium = helium-3

C. Two helium-3 = helium-4 + energy

+ 2 hydrogen

Page 46 – figure 12

fusion310

nucl

ei

neu

trons

nucl

ei a

nd neu

trons

pro

tons

and e

lect

rons

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The number of ____ are what

give an atom its chemical

identity. 1. nuclei

2. neutrons

3. nuclei and neutrons

4. protons and

electrons

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hyd

rogen

deu

terium

hel

ium

-3

hel

ium

-2

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Fusion of hydrogen in the sun results

in two ____ atoms combining to

form ordinary helium-4.

1. hydrogen

2. deuterium

3. helium-3

4. helium-2

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IV. Sun’s surface

A. Sunspots

1. Dark spots

2. Cool areas

http://sohowww.nascom.nasa.gov/data/synoptic/sunspots_earth/mdi_sunspots_1024.jpg

B. Solar flares

1. Storms

2. Cause auroras

Mauna Loa

Observatory

features214

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photo

spher

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coro

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The ____ forms the sun's outer

atmosphere where the gases are so thin

that this layer is visible only during a

total solar eclipse.

1. chromosphere

2. photosphere

3. corona

4. convective zone

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

coro

na

photo

spher

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rad

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conve

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The ____ is where the gases get thick

enough to see and is what we know as

the visible surface of the sun.

1. corona

2. photosphere

3. radiative zone

4. convective zone

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4.6

8.3

12.6

16.5

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The speed of light is about 3108 m/s and

the sun is about 1.51011 m from Earth.

When energy leaves the sun as light, it

takes ____ minutes to reach the Earth.

1. 4.6

2. 8.3

3. 12.6

4. 16.5

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