'To find gas and oil, geologists may set off an explosion & measure the waves using this instrument'
a seismograph
GEOLOGY: To find gas and oil, geologists may set off an explosion & measure the waves using this instrument
To find gas and oil, geologists may set off an explosion & measure the waves using this instrument
To find gas and oil, geologists may set off an explosion & measure the waves using this instrument
GEOLOGY
a seismograph
GEOLOGY