موضوع كتبته لطلاب اولى ثانوى عن الدلافين باللغة الانجليزيه

1. Whales, dolphins and sharks


2. 0Dolphins


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4. Can dolphins really beat up sharks?


5. 0How Do Sharks Swim When Asleep?

هذا الموضوع طلبته منى صديقى عزيزة فى الصف الاول الثانوى
وهو عن الدلافين وحياة اعماق البحار وارجو ان تستفيد منه الفتيات فى هذا السن وشكرا لكم

Whales, dolphins and sharks

Whales, dolphins and sharks are considered of the most biggest creatures under seas which attack people sometimes and help him by different ways >Whale s
When we talk about them we say that here are two types of whale - those with teeth and those without. The two sorts of whales, toothed and whalebone, appear to have been separate since at least 40 million years ago.
Blue Whale, the Humpback Whale and the Minke Whale, among others. All of these are -called 'whalebone'
Some kinds of Whales can be in small groups in the open seas and are found in all oceans.
They are very fast-swimming creatures, and show similar migratory patterns to Blue Whales, with a general northwards movement of southern animals into warmer waters for breeding during the southern winter season. After breeding, the whales return to the Antarctic.
We have now some of the most
Sperm whale
in this kind of Whales Females twice the size of males and weighs 50 tons,
you can find this kind in Open sea, in schools of 15-20 whales
it Can dive to 2250m depth, can swim 22km/h, lives off octopus, shellfish and seals, can live up to 50 years and its
Size can be 13-25m
Bowhead (Balaenoptera physalus)
This is Second longest whale in the world, blows thin air/water vertically 4-7m, female larger than male.
Can be existed in Open sea
it also Can dive for 4-30 minutes, lives off fish and can live up to 80 years.
and its
Size can be 27,3m

0Dolphins

There are many kinds of Dolphins such as those inhabited in the rivers of India and which is almost blind, only able to distinguish vague shapes and light from dark.
Examining the dolphin you can see that The bones have evolved this way to aid direction finding by sonar - the dolphin's sonar blips return back to its head at very slightly different times from different directions. This is known as echo-location
Dolphins are conscious breathers, actually having to think about rising to the surface, opening their blowholes, and breathing. From Russian studies carried out in the early 1970's, we know that dolphins catnap in 2 to 3-minute stretches, actually shutting down one hemisphere of their brain at a time.
There are many kinds of Dolphins such as:
Dolphin (Delphinus delphis)
It has long jaws with sharp teeth, dark gray or black sides
Can be existed in Open sea, near coasts
It is Very social and intelligent, lives in flocks, the shark's only natural enemy since they can ram their sides with their hard noses > in this kind the Size can be 2,5m
Sharks
When we go to sharks we feel panic as they are related in our minds with blood , fear and killing people >There are many kinds of sharks such as the following :
Blue Shark :
When we describe this kind we find that it is : Blue gray, white underneath, triangular teeth
It can be found in Open sea
It is about 4mHammer Head Shark
You can easily recognize it by its Flat head, shaped as a hammer with eyes on each edge
It can be found in Open and also about 4m
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(Cetorhinus maximus)
This kind has a big mouth with small teeth
can be found in Open sea, sometimes shallow waters
it is about 15 m .Great White Shark
It is Silver gray, big, triangular, jagged teeth
can be found in Open sea , always about 12m
as it is big and dangerous so it is
not what you want to see when you go swimming

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Can dolphins really beat up sharks?

This question was coming to our minds because of the incident that took place at the Miami in the 1950's. When a Sandbar Shark showed with three of the adult male dolphins ganged up on the shark, butting it in the gills and stomach until it died.
. There is also a record of a Bottlenose Dolphin off California killing a two-foot Leopard Shark (then supporting it at the surface .
Those accidents raises doubts about tales of dolphins 'rescuing' human swimmers .
perhaps it was dolphin game as we now that dolphins are really friendly .
so this question leads as to this fact that dolphins Usually do not beat up sharks unless the shark is relatively small.
This also leads us to a simple fact that dolphins are able to classify sharks as either dangerous or not dangerous

0How Do Sharks Swim When Asleep?

There is some big questions about whether or not sharks sleep and, if they do, how do they swim while unconscious:
Some writers said that “ Sleep is one of the last bastions of mystery that Science has yet to conquer. Despite several centuries of study, speculation, and debate, we still really don't know what sleep is or why we need to 'shut down' periodically “
they also added “ we just don't know. There have been reports from all over the globe, including Mexico, Japan, and Australia, of sharks resting motionless in caves.
These have been called "sleeping sharks", but we can attest that the eyes of these quiescent sharks do follow divers moving about in the caves with them, so they're definitely not asleep
0SHARK TEETH
Sharks have the most powerful jaws on the planet. Unlike most animals' jaws, both the sharks' upper and lower jaws move.
A shark bites with it's lower jaw first and then its upper. It tosses its head back and forth to tear loose a piece of meat which it swallows whole.