# Focus On Earth Science: California Grade 6

## Chapter 2: Earth's Structure

### Math Practice

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 1 If an S-wave has a velocity of 2.8 km/s in Earth’s core, what is the loss in velocity as the wave travels from the mantle to the core? Need a Hint? A) 0.7 km/s B) 4.5 km/s C) 1.2 km/s D) 0.2 km/s 2 If an S-wave has a velocity of 3.0 km/s in Earth’s crust, what is the gain in velocity as the wave travels from the crust to the mantle? Need a Hint? A) 1.0 km/s B) 0.5 km/s C) 1.5 km/s D) 2.0 km/s 3 What is the loss of speed as a P-wave travels at a velocity of 5.1 km/s through Earth’s crust through the mantle? Need a Hint? A) 2.0 km/s B) 3.0 km/s C) 3.1 km/s D) 2.9 km/s 4 If an S-wave has a velocity of 3.5 km/s in Earth’s crust, what is the gain in velocity as the wave travels from the crust to the mantle? Need a Hint? A) 0.5 km/s B) 1.0 km/s C) 1.0 km/s D) 1.5 km/s 5 If an S-wave has a velocity of 2.6 km/s in Earth’s core, what is the loss in velocity as the wave travels from the mantle to the core? Need a Hint? A) 1.9 km/s B) 7.1 km/s C) 2.0 km/s D) 1.5 km/s 6 What is the loss of speed as a P-wave travels at a velocity of 6.7 km/s through Earth’s crust through the mantle? Need a Hint? A) 1.0 km/s B) 1.3 km/s C) 2.0 km/s D) 2.3 km/s 7 If an S-wave has a velocity of 3.0 km/s in Earth’s core, what is the loss in velocity as the wave travels from the mantle to the core? Need a Hint? A) 0.5 km/s B) 2.0 km/s C) 1.0 km/s D) 1.5 km/s 8 If an S-wave has a velocity of 4.0 km/s in Earth’s crust, what is the gain in velocity as the wave travels from the crust to the mantle? Need a Hint? A) 2.0 km/s B) 1.0 km/s C) 1.5 km/s D) 0.5 km/s 9 What is the loss of speed as a P-wave travels at a velocity of 5.8 km/s through Earth’s crust through the mantle? Need a Hint? A) 1.2 km/s B) 2.2 km/s C) 1.0 km/s D) 0.8 km/s 10 If an S-wave has a velocity of 3.2 km/s in Earth’s crust, what is the gain in velocity as the wave travels from the crust to the mantle? Need a Hint? A) 1.3 km/s B) 1.0 km/s C) 1.5 km/s D) 0.8 km/s