Q4_L29 EARTHQUAKES

Who discovered the existence of seismic waves beneath the surface of the Earth?

• Alfred Wegener

• Frank B. Taylor

• Harry H. Hess

• Andrija Mohorovicic

What theory suggests that the crust of the Earth is made up of a number of large rigid plates?

• Theory About the Movement of the Earth's Crust

• Seafloor Spreading Theory

• Continental Drift Theory

• Plate Tectonic Theory

What is the process where there is a gradual addition of new oceanic crust in the ocean floor through volcanic activity?

• Compression

• Faulting

• Folding

• Seafloor Spreading

Which scientist suggested that continents were once joined together in a single land mass called Pangaea?

• Victor Vescovo

• Don Walsh

• Alfred Wegener

• Harry H. Hess

What type of stress happens when rocks are stretched or 'pulled-apart'?

• Folding

• Shearing

• Tension

• Compression

What is the effect of tension stress on rocks?

• Folding

• Faulting

• Melting

• Breaking

What type of fold is a gently dipping bend in horizontal rock layers?

• Asymmetrical Folds

• Synclines

• Anticlines

• Monoclines

What is the type of fault caused by the tension in the Earth's crust pulling a rock apart?

• Normal Fault

• Strike-slip Fault

• Thrust Fault

• Reverse Fault

What should you do during an earthquake to stay safe?

• Stay under a desk or table

• Run outside immediately

• Use the elevator

• Stay near glass windows

What should you do after an earthquake if you smell a gas leak?

• Ignore it

• Stay inside

• Open the windows and doors to dissipate the gas leak

• Light a match