1. Why is long-term data collection, often over many years, necessary when using GPS to study plate motion?
- A. GPS satellites require several years to calibrate their instruments correctly.
- B. A single measurement is insufficient because tectonic plates move extremely slowly.
- C. Scientists must wait for a major earthquake to occur to get a valid reading.
- D. It takes years for the GPS signals to travel from the satellite to the receiver and back.
2. A scientist places one GPS receiver in central Africa and another in central South America. After a decade, the data shows the distance between the two receivers has increased by about 25 centimeters. What is the best conclusion from this data?
- A. The receivers are likely malfunctioning.
- B. The Atlantic Ocean is gradually getting wider.
- C. A new mountain range is forming between the continents.
- D. The Earth's magnetic field has reversed.
3. What specific information about tectonic plates can scientists calculate using data from a network of GPS receivers?
- A. The exact age and chemical makeup of the plate.
- B. The temperature and pressure deep within the mantle.
- C. The precise speed and direction of the plate's movement.
- D. The likelihood of a volcanic eruption at a specific location.
4. Imagine GPS data shows that two points on opposite sides of a plate boundary are moving towards each other. What geological process is this data providing evidence for?
- A. Seafloor spreading
- B. Plate convergence
- C. A transform fault
- D. Mantle convection
5. What is the primary role of the Global Positioning System (GPS) in the study of plate tectonics?
- A. To predict the exact timing and magnitude of future earthquakes.
- B. To measure the slow, continuous movement of Earth's crustal plates.
- C. To create detailed topographical maps of the ocean floor.
- D. To analyze the chemical composition of volcanic rock samples.
6. Which of the following everyday processes occurs at a rate most similar to the movement of tectonic plates?
- A. A person walking at a casual pace
- B. A garden snail crawling across a path
- C. The growth of a human fingernail
- D. A commercial airplane cruising at high altitude
7. Why do humans not perceive the constant motion of the tectonic plates beneath them?
- A. The plates only move during large earthquakes.
- B. The movement is too slow and gradual to be felt.
- C. The motion occurs too deep in the Earth's mantle.
- D. The atmosphere absorbs the vibrations from the movement.
8. What is the primary reason that significant changes in the positions of continents, like the widening of an ocean, take millions of years to occur?
- A. The continents are incredibly massive and heavy.
- B. The plates frequently stop moving for long periods.
- C. The rate of tectonic movement is extremely slow.
- D. Ocean currents push against the continents, slowing them down.
9. If a specific tectonic plate moves at a steady rate of 2 centimeters per year, how far will it travel in 1,000 years?
- A. 20 centimeters
- B. 2 meters
- C. 20 meters
- D. 2 kilometers
10. The scientific understanding of plate tectonics challenges which common human perception about the Earth?
- A. The idea that the Earth is a sphere.
- B. The perception that the ground we stand on is completely stationary and fixed.
- C. The knowledge that earthquakes are a result of sudden shifts in the Earth's crust.
- D. The observation that volcanoes are typically found near the edges of continents.