Doug explores the concept of mountains and volcanoes, using Heimay Island as an example of a mountain that became a volcano. He discusses various volcanoes in the U.S., how to identify volcanic mountains, and extinct volcanoes. The video concludes with a call to vote on the next episode's topic.

What did Doug initially consider a mountain during his childhood?

• A hill made of garbage

• A tree-covered hill

• A large rock formation

• A tall building

What surprising event occurred on Heimay Island in 1973?

• A massive earthquake

• A landslide

• A severe storm

• A volcanic eruption

Which mountain in Northern California erupted in 1915?

• Mount St. Helens

• Mount Hood

• Mount Rainier

• Mount Lassen

Which mountain blew off half its top in 1980?

• Mount Rainier

• Mount Hood

• Mount St. Helens

• Mount Lassen

What type of rock is commonly associated with volcanoes?

• Sandstone

• Basalt

• Limestone

• Granite

What evidence suggests that Mount Everest is not a volcano?

• Presence of volcanic rock

• Fossils of ocean animals

• Frequent eruptions

• Dark, tough rock

What is a key characteristic of basalt rock?

• It has air bubbles

• It is light in color

• It crumbles easily

• It is soft

What can be a clue that a mountain might be a volcano?

• The presence of trees

• Its location

• The type of rock it is made of

• Its height

Which U.S. state has mountains made of basalt, despite being far from known volcanoes?

• Missouri

• California

• Oregon

• Washington

What is the main reason most mountains do not erupt lava unexpectedly?

• They are made of non-volcanic rock

• They are too small

• They have erupted in the past

• They are located in cold regions