GRADE – 9

SCIENCE

Unit 7: Earth and Space

Lesson: 7.7 – Exploring Mars (Pg. 110-111)

•To discuss about exploring Mars

LESSON OBJECTIVE

Textbook Page: 110

Notes

Q1. Answer:

Because he saw changes in bright and dark patches across the

surface – this suggested clouds in an atmosphere.

Q2. Answer:

Because they had observed that Mars is more similar to Earth

than any other planet, has an atmosphere similar to Earth and

the presence of ice caps suggested water.

Q3. Answer:

i. Mars atmosphere is very thin

ii. The atmosphere was almost totally CO2

iii. Daytime temperatures were estimated to be -100 °C

Q4. Answer:

It confirmed that Mars has atmosphere. (Or craters on surface)

Q5. Answer:

Because Mariner 9 photographed entire surface of

the planet, not just a part.

Note (No need to write)

Q6. Answer:

Because of cold weather and it was covered in dust so sunlight could not

reach photocells.

Q7. Answer:

i. Rovers can carry astronaut.

ii. Rovers can examine more territory and can make microscopic

observations.

(Mark these points

in the textbook)