<< Chapter < Page Chapter >> Page >

Natural sciences

Planet earth and the universe

The earth

Educator section

Memorandum

Assignment 5:

4 (sketch)

Assignment 6:

True

True

False; the first moon landing was in 1969n when the Americans Nail Armstrong and Edwin Aldrin landed on the Moon in Apollo II.

True

False; During neap tide the tide is a bit lower than normal.

False; the moon looks bigger than other objects because it is the nearest celestial body to the earth.

True

Leaner section

Content

Activity: to study the properties of the moon and to identify their influences on the earth [lo 1.3, lo 2.3]

INTRODUCTION

  • Earth has one moon that orbits it. The moon has no light of its own but reflects sunlight. It takes the moon 29,5 days to orbit the earth. There is no life, air, wind or water on the moon. Comets, asteroids and meteors that have collided with the moon have caused huge craters on the surface. Temperatures on the moon vary from 200 degrees Celsius to –120 degrees Celsius.
  • At different times of the month the moon appears to assume different shapes. This is because the human eye sees different parts of the moon that are illuminated by the sun as the moon orbits around the earth.
  • As the moon orbits, it influences the sea level as the moon has its own gravity, which affects the sea. This change in water levels is called the tides.

PHASES OF THE MOON

  • When the moon is exactly between the earth and the sun it cannot be seen. This is known as a New moon. Thereafter the moon resembles a sickle. This is known as a Crescent moon. Only a small portion of the moon is visible. As the moon travels around the earth, the visible portion grows larger until the First quarter is reached. The sunlit area continues to grow until Full moon. Then the sunlit portion grows smaller until it reaches the Last quarter and continues to shrink until the visible portion forms the Crescent moon again and so on until the next New moon.

TIDES

  • Because the moon is much closer to the earth than the sun it has a far greater gravitational effect on the earth. At full moon and new moon both the moon and the sun pull on the earth in the same direction. This means that the tides are higher than normal. This is known as spring tide.
  • When the moon is in the first and last quarter the sun and the moon pull at right angles to each other. This causes tides that are lower than usual. This is known as neap tide. The earth rotates around its axis every 24 hours and so there are two high tides and two low tides every day.

TASK 5

On the sketch below supply the correct labels for the phases of the moon.

TASK 6

STATEMENT T F CORRECTION
The moon is a satellite of the earth. _____________________________
The earth is a satellite of the sun. _____________________________
No astronauts have landed on the moon. _____________________________
A lunar eclipse doesn’t occur with each full moon because most of the time the moon does not move through the earth’s shadow. _____________________________
During neap tide the level of the sea is slightly higher than normal. _____________________________
The moon looks bigger than other celestial objects, because it is immensely large. _____________________________
The first and last quarters of the moon are also known as Half moon. (10) _____________________________

Assessment

Learning Outcome 1: The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

Assessment Standard 1.3: We know this when the learner evaluates data and communicates findings: generalises in terms of a relevant aspect and describes how the data supports the generalisation

Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard 2.3: We know this when the learner interprets information: interprets information by identifying key ideas in text, finding patterns in recorded data, and making inferences from information in various forms (e.g. pictures, diagrams, text).

Questions & Answers

what is math number
Tric Reply
x-2y+3z=-3 2x-y+z=7 -x+3y-z=6
Sidiki Reply
Need help solving this problem (2/7)^-2
Simone Reply
x+2y-z=7
Sidiki
what is the coefficient of -4×
Mehri Reply
-1
Shedrak
the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
Alfred Reply
An investment account was opened with an initial deposit of $9,600 and earns 7.4% interest, compounded continuously. How much will the account be worth after 15 years?
Kala Reply
lim x to infinity e^1-e^-1/log(1+x)
given eccentricity and a point find the equiation
Moses Reply
12, 17, 22.... 25th term
Alexandra Reply
12, 17, 22.... 25th term
Akash
College algebra is really hard?
Shirleen Reply
Absolutely, for me. My problems with math started in First grade...involving a nun Sister Anastasia, bad vision, talking & getting expelled from Catholic school. When it comes to math I just can't focus and all I can hear is our family silverware banging and clanging on the pink Formica table.
Carole
I'm 13 and I understand it great
AJ
I am 1 year old but I can do it! 1+1=2 proof very hard for me though.
Atone
hi
Adu
Not really they are just easy concepts which can be understood if you have great basics. I am 14 I understood them easily.
Vedant
find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
If f(x) = x-2 then, f(3) when 5f(x+1) 5((3-2)+1) 5(1+1) 5(2) 10
Augustine
how do they get the third part x = (32)5/4
kinnecy Reply
make 5/4 into a mixed number, make that a decimal, and then multiply 32 by the decimal 5/4 turns out to be
AJ
how
Sheref
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
I rally confuse this number And equations too I need exactly help
salma
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
salma
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
hi
salma
hi
Ayuba
Hello
opoku
hi
Ali
greetings from Iran
Ali
salut. from Algeria
Bach
hi
Nharnhar
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Natural sciences grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11077/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natural sciences grade 7' conversation and receive update notifications?

Ask