Question

Fill in the blanks.
1. A flame is produced when gases combine with ................. releasing a lot of energy.
2. Small gaps are left in a railway track to allow for ................ in summer.
3. Bimetallic strips .............. on heating.​

Answer 1

Answer:

Oxygen

Explanation:

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Answer 2

Answer:

1. Oxygen

2.expand

3.expand

Explanation:

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