geophysics
Definition
Geophysics is the study of Earth's physical properties. It uses the principles of physics, chemistry, and mathematics to study Earth's interior, its atmosphere, and its oceans.
Geophysicists use a variety of tools to study Earth, including:
- Seismographs: These instruments measure the vibrations that travel through Earth's crust during earthquakes.
- Magnetometers: These instruments measure Earth's magnetic field.
- Gravity meters: These instruments measure the strength of Earth's gravity.
- Satellites: These instruments can be used to measure Earth's temperature, composition, and surface features.
- Computer models: These models can be used to simulate Earth's interior and to predict how it will change over time.
Geophysics is a very important field of study. It helps us to understand our planet and its history, and it also helps us to predict future events, such as earthquakes and volcanic eruptions.
Geophysicists work in a variety of settings, including universities, government agencies, and private companies. They use their knowledge to help us understand Earth's natural resources, predict natural hazards, and develop new technologies.
How can the word be used?
The field of geophysics is a multidisciplinary field that draws on knowledge from physics, chemistry, geology, and mathematics.
Different forms of the word
Noun: geophysics.
Adjective: geophysical.
Verb: to geophysic.
Etymology
The word "geophysics" comes from the Greek words "geo" (γη), which means "earth", and "physika" (φυσικά), which means "physics". Literally, the word "geophysics" means "physics of the Earth".
Question
What is geophysics?
AQA Science Exam Question and Answer
Question: What is a seismograph?
Answer:
A seismograph is an instrument that is used to measure the ground motion caused by earthquakes. Seismographs are used to record the size and strength of earthquakes, and they can also be used to study the Earth's interior.
Seismometers are the devices that measure the ground motion. They are typically placed on a solid foundation, such as bedrock, to minimise the effects of vibrations from traffic and other sources. The seismograph records the ground motion on a paper chart or a digital recorder.
Seismometers are sensitive to vibrations of different frequencies. Low-frequency vibrations are caused by large earthquakes, while high-frequency vibrations are caused by small earthquakes and other sources, such as traffic.
Seismologists use seismographs to study earthquakes and the Earth's interior. They can use the information from seismographs to determine the size and strength of earthquakes, the location of the epicentre, and the depth of the focus. Seismologists can also use seismographs to study the Earth's interior by looking at the way that seismic waves travel through the Earth.