Wonder #2821: How Hot Is the Center of the Earth?

Question 1 of 3

What is the deepest hole that humans have ever drilled into the Earth’s surface, according to this Wonder?

1. 3.1 miles (5 kilometers)
2. 7.6 miles (12 km)
3. 43.5 miles (70 km)
4. 18.6 miles (30 km)

Question 2 of 3

According to this Wonder, how do experts learn about the Earth’s layers?

1. by examining rocks and minerals extracted from the crust
2. by studying seismic waves caused by earthquakes and how they travel through the Earth
3. by drilling very deep into the Earth’s layers and sending scientists down into the hole to analyze the findings
4. by reviewing satellite images of the slowly changing shape of the planet

Question 3 of 3

Which of the following is NOT one of the Earth’s four layers?

1. mantle
2. crust
3. inner core
4. magnetic field

Check your answers online at https://wonderopolis.org/index.php/wonder/How-Hot-Is-the-Center-of-the-Earth.