A Right
B Wrong
C Not mentioned
18 Earth cooled down shortly after it was formed.
A Right
B Wrong
C Not mentioned
19 Scientists once estimated that Earths crust started shifting three billion years ago.
A Right
B Wrong
C Not mentioned
20.It took a long time for the melted crust to become hard.
A Right
B Wrong
C Not mentioned
21.The formation of the Isua supracrustal belt is thought to have started about 3.8 billion years ago.
A Right
B Wrong
C Not mentioned
22. The lsua supracrustal belt is now a popular holiday resort.
A Right
B Wrong
C Not mentioned
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