The Relative Size and Distance of the Earth, the Moon and the Sun

The Relative Size of the moon, the Earth and the Sun.

The Relative Distance of the moon, the Earth and the Sun.

Solar System 【Images】

Our galaxy - the Milky Way - is a spiral galaxy with arms extending from the center like a pinwheel. Our solar system is in the Orion arm of the Milky Way. Our Sun is one of about 100 billion stars in the Milky Way. And our galaxy is just one of roughly 100 billion in the visible universe.

The SUN

MERCURY

VENUS

EARTH

MARS

JUPITER

SATURN

URANUS

NEPTUNE

Solar System 【Video】

Exercise 2

Link to : Basic Needs of Organism

Choose the correct answer.

1. Which of the following is not the basic needs of a human?
A. Food
B. Fertilizer
C. Water
D. Shelter

2. Why do humans needs to eat food?
I. To get energy
II To grow
III To stay healthy
A. I and II only
B. I and III only
C. II and III only
D. I, II and III

3. Why do plants need water?
I. To carry out photosynthesis
II To support the stem
III To reduce heat
IV To obtain energy

A. I and II only
B. II and III only
C. I,II and III only
D. II, III and IV only

4. Which of the following is not paired correctly?

	Animal	Food
A	Bee	Nectar
B	Frog	Insect
C	Snake	Grass
D	Panda	Bamboo leaves

5. What role does chlorophyll play in photosynthesis?

A. To absorb water

B To produce chemical reaction

C To absorb sunlight

D To turn into sugar

^_^

Answer:

1. B

2. D

3. C

4. C

5. C

Basic Needs of Organism.

Let's do an experiment.

Plant Need Sunlight.

Hypothesis: Plants need sunlight to survive.

Constant variable: The species and size of the balsam plant.
Manipulated variable: The presence of sunlight.
Responding  variable: Growing condition of the balsam plants.

Produce:

1. Put the balsam plant T and U under the sun.
2. Use a black box to cover balsam plant U.
3. Water the balsam plants T and U everyday. After 1 week, observe the growing condition of balsam plant T and U.

Observation:

Balsam Plant	Growing Condition
T	Grew healthily
U	Turned yellow

Concluesion: Plants need sunlight to grow.

Notes.