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inn [45]
3 years ago
6

How long did it take for humans to migrate to North America from Africa?​

Geography
1 answer:
posledela3 years ago
7 0
Mrsooooo beak and brown green green
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P and S waves from an earthquake travel at different speeds, and this difference helps locate the earthquake "epicenter" (where
Studentka2010 [4]

Answer:

(a) Since both P and S wave travels the same distance, so it can be written as:    Δx = V₁t₁ = V₂t₂,

Where, V₁- Speed of S wave

            V₂- Speed of P wave

            t₁- time taken by S wave

            t₂- time taken by P wave

Therefore, t₁ > t₂ (since, time taken by S wave is longer than P wave)

⇒ t₁ = t₂ + 1.5 min

⇒ t₁ = t₂ + 90 sec

⇒ V₁ (t₂ + 90 sec) = V₂ (t₂)

⇒ V₁t₂ + V₁ (90 sec) = V₂ (t₂)

⇒ V₂t₂ - V₁t₂ = V₁ (90 sec)

⇒ t₂ (V₂- V₁) = V₁ (90 sec)

⇒ t₂ = {V₁ (90 sec)} ÷ {(V₂- V₁)}

⇒ t₂ = {5.5 × (90 sec)} ÷ {(8.5 - 5.5)}

Therefore, t₂ = 165 sec

Since, Δx = V₁t₁ = V₂t₂

Now, Δx = V₂t₂ = (8.5 × 165 sec)

⇒ Δx = 1402 km

Therefore, Δx is approximately 1400 km (this means that the earthquake occurred at a distance of about 1400 km from the recorded seismic station)

(b) No, Only seismic station is not sufficient to detect the epicenter of an earthquake. Seismologists and geologists usually use the triangulation method in order to determine the exact location of the epicenter. This is possible by the use of three seismographs that are placed at three different locations nearby to that earthquake occurring position.

8 0
3 years ago
What were the four main reasons as to why these ancient people settled near rivers?​
lora16 [44]

Answer:

food, water, transportation, bathing

"hope this helps"

Explanation:

7 0
3 years ago
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Soil degradation and erosion in a region where many people are subsistence farmers can lead to which of the following results?
suter [353]
A. Food Scarcity would be it
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2 years ago
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Anyone willing to help?
Paha777 [63]

the first one is Equator and the second one is tundra should be the right answer sorry if it's wrong

6 0
3 years ago
g homo habilis is the first species of the genus homo. it is [ select ] similar to other homo species, like homo erectus, than t
Natali5045456 [20]

Sahelanthropus, Orrorin, Ardipithecus, Australopithecus, and Paranthropus are just a few of the genera that exhibit postcranial transformation and canine reduction throughout the first four million years or so of hominid evolution. There is a concurrent change in the hominid fossil record as the Pliocene epoch came to an end and the world climate was changing about 2.5 million years ago. Something novel arose in this setting, both physically and behaviorally, as it became cooler. The genus Homo originated from this.

The commencement of the transition from primordial, large-brained, stone tool-making, meat-eating apes that spread out across the globe to the species Homo's beginnings in Africa is marked by this change. Three species, Homo habilis, Homo rudolfensis, and Homo erectus, are considered to be the earliest members of the human genus. It is well known that H. habilis was the first species to produce stone tools and that it still possesses basic characteristics that connect it to australopiths. Aside from the fact that H. rudolfensis shared both time and space with other early Homo and had a larger brain and set of teeth than H. habilis, little is known about this species. Thanks to its extensive fossil record, we now have a better grasp of the paleobiology and evolution of the more complex H. erectus. With a physique designed for contemporary striding locomotion, H. erectus was the first fully committed, obligate biped to emerge outside of Africa. It was also the first member of the human ancestry to leave Africa. The first Homo species are the ones who tipped our evolutionary history's scales away from the more ape-like direction and toward the more human one.

To know more about Australopithecus

brainly.com/question/10500441?referrer=searchResults

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