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Valentin [98]
2 years ago
11

How do scientists know the continents were once closer than they are today? Explain your answer in 2-3 complete sentences.

Physics
1 answer:
WITCHER [35]2 years ago
6 0

Answer:

Continental drift describes one of the earliest ways geologists thought continents moved over time. Today, the theory of continental drift has been replaced by the science of plate tectonics. 

 

The theory of continental drift is most associated with the scientist Alfred Wegener. In the early 20th century, Wegener published a paper explaining his theory that the continental landmasses were “drifting” across the Earth, sometimes plowing through oceans and into each other. He called this movement continental drift. 

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We drive at a speed of 20 km/h for 3 hours. Then we drive 4 hours at 30 km/h. Calculate our average speed.
Afina-wow [57]

First speed = 20km/h

Time = 3 hours

Distance = 3×20

<h3> = <u>60 km</u></h3>

Second speed = 30km/h

Time = 4 hours

Distance = 4×30

<h3> = <u>120 km</u></h3>

Total distance = 60+120 = <u>180km</u>

Total time = 3+4 =<u> 7 hours</u>

Average speed = 180/7

<h3> = <u>25.71</u><u> </u><u>km</u><u>/</u><u>h</u></h3>

Hope this will help...

4 0
3 years ago
Read 2 more answers
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klasskru [66]
Energy in a spring:

E = 0.5 * k * x²

k spring constant = 800 n/m
x stretch of the spring = 5 cm = 0.05 m

E = 0.5 * 800 * 0.05² = 1
5 0
3 years ago
While watching a movie a spaceship explodes and there is a loud bang and flash of light. What is wrong with this scene? Explain
Ksenya-84 [330]
Well if the ship was in space their shouldn’t be a loud bang. Because you can’t hear anything in space
4 0
2 years ago
What occurs during stage one sleep
Mekhanik [1.2K]

Answer:

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Explanation:

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Answer:

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