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Who invented the Geophone, an instrument that measures vibrations in the Earth? 

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Who invented the Geophone, an instrument that measures vibrations in the Earth? 

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Professor Jean Perrin created the geophone in 1915. 

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Professor Jean Perrin created the geophone in 1915. 

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He initially created it to listen for enemies coming in war.

https://prezi.com/xmqdfnczhqk5/the-geophone/

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The Geophone is mentioned in "The Elephant Scientist" by Caitlin O'Connell and Donna M. Jackson because it helps simulate the vibrations that the elephants feel through their feet.
The elephants stand on their tip toes because they feel different vibrations.

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Elephants generally don't have any predators due to their massive size. 

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Elephants generally don't have any predators due to their massive size. 

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However, newborn elephants need to be more aware of attacks from wildcats.

Humans are the biggest elephant predators.

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Poaching.

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Why is the female the the head of the tribe?

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Why is the female the the head of the tribe?

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Matriarch.

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Often times, the females are the head of the tribe because the males will separate from the heard to go mate. 

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Often times, the females are the head of the tribe because the males will separate from the heard to go mate. 

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Females also lead the tribe to find water and food for their calves. The women travel in heard together to also ensure the safety of the calves.

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Are there any physical differences between male and female elephants?

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Are there any physical differences between male and female elephants?

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Female(left) elephant and Male(right) elephant

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Female(left) elephant and Male(right) elephant

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Male elephants are significantly larger than the females. 

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Male elephants are significantly larger than the females. 

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Male and Females both have tusks. The only difference is that males tusks are longer and heavier than female tusks.

Sajem, Y. (2017, August 11). Differences Between a Male & Female African Elephant. Retrieved November 5, 2018, from https://animals.mom.me/differences-between-male-female-african-elephant-8056.html