The Diamond Of Darkhold

Lina and Doon trade matches for the book. Matches are a valuable commodity in their underground city of Ember, as they are used for lighting and heat. The book is seen as a treasure, containing important information about the outside world, so trading matches for it shows the significance they place on knowledge and their desire to learn more about the world beyond Ember.

Doon believes that the builders left the device spoken of in the book. This is because the builders were the ones who constructed the underground city of Ember and designed all the systems and devices within it. As Doon explores the city and tries to find a way to save it, he discovers clues and evidence that point to the builders as the creators of the device. Therefore, he believes that they are the ones responsible for leaving it behind.

Scawgo helps Doon escape captivity in Ember.

When Doon finds Lina, she is in a dangerous situation as she is being attacked by wolves. This is evident from the fact that the other options do not align with the context provided in the question. The mention of a doctor, being lost, abducted by aliens, or looking for diamonds does not fit the scenario described. Therefore, the most logical explanation is that Lina is being attacked by wolves when Doon finds her.

The book has eight pages.

Scawgo is the adopted member of the Trogg family because the question asks specifically about the adopted member.

Lina yells "Goodbye, Ember. Forever!" from the top of the mayor's building. This suggests that Lina is bidding farewell to the city of Ember, possibly indicating that she is leaving the city permanently. The phrase "Goodbye, Ember. Forever!" implies a sense of finality and emphasizes Lina's intention to never return to Ember.

The people of Sparks were able to make it through the winter by salvaging food from Ember. This suggests that they were able to gather and collect food supplies from the city of Ember, possibly finding leftover provisions or rationed supplies that were left behind. This resourcefulness and ability to find sustenance from their neighboring city helped them survive the harsh winter conditions.

Lina and Doon discover that the diamonds are sources of electricity. This implies that the diamonds have the ability to generate electrical energy or conduct electricity. This discovery could be significant as it suggests that diamonds can be used as a renewable energy source or in the development of advanced electronic devices.

The story ends with a vantage point from Aliens. This suggests that the story may have taken a sci-fi or fantasy turn towards the end, where aliens play a significant role. The vantage point from aliens could imply that they have been observing or influencing the events of the story, leading to a conclusion involving their perspective or actions.