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If you are referring to Pangea, the theorized land mass that all continents were once part of, they know this because of the continents' puzzle like features, because things most likely exploded apart, causing the seemingly random shapes of the shores of the continents.

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Q: How do scientists know that the continents were a big land mass?
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Related questions

What do scientists call the land mass that all the continents used to be in?

Pangea


What evidence do scientists have to support the idea that the continents were once one large land mass?

the evidence is istoy lng.......


What is the continents of Asia are really parts of the same land mass?

What is the continents of asia are really parts of the same land mass?


Which two continents are part of huge land mass that were separated?

All the continents used to be a part of one land mass and separated. This supercontinent was Pangea.


The two continents that are located on a single land mass are called?

Eurasia is the single land mass that consists of Europe and Asia. It is the largest contiguous landmass on Earth, and the terms Europe and Asia are used to distinguish the western and eastern parts of this landmass.


Which of the seven continents is biggest in land area?

Asia is the biggest in land mass.


What is the name given to the early continents?

The early continents are known as "cratons" or "proto-continents." These were the building blocks of the current continents and formed during the Precambrian era.


If fossils of the same land animal are on different continents what do you Infer?

The inference is that both continents were once one single land-mass.


Which two continents have the largest land mass?

Asia and Africa.


How is Asia similar to other continents?

Asia, like other continents, has a diverse range of landscapes, cultures, and languages. It is also home to many different countries with their own histories and traditions. Additionally, Asia plays a significant role in global economics and politics, similar to the influence of other continents.


What continents share the same land mass?

Europe and Asia


What was the land mass called before the continents split?

The land mass was called Pangaea before the continents split into the continents we know today. Pangaea was a supercontinent that existed about 335 million years ago.