Term
|
Definition
| A fault is any fracture in Earth's crust. |
|
|
Term
|
Definition
| The force exerted on an object when another object presses, pulls or pushes it. |
|
|
Term
|
Definition
| Any shaking of the ground caused by the sudden movement of blocks of rock along a fault. |
|
|
Term
| Why do most earthquakes occur along tectonic plate boundaries? |
|
Definition
| There are many breaks in the rock along plate boundaries and the rocks on opposite plates move. The movements causes earthquakes. |
|
|
Term
| Where are earthquakes most common? |
|
Definition
| Earthquakes are most common along plate boundaries. |
|
|
Term
|
Definition
| The focus of an earthquake is the place where rocks first start to move. |
|
|
Term
|
Definition
| An epicenter is the point on the surface directly above the focus. |
|
|
Term
|
Definition
| Seismic waves are the vibrations caused by an earthquake. |
|
|
Term
| How are the focus and the epicenter of an earthquake related? |
|
Definition
| The focus is the underground spot where rocks first begin moving in an earthquake. The epicenter is on Earth's surface directly above the focus. |
|
|
Term
| What are the three different types of seismic waves? |
|
Definition
- primary waves
- secondary waves
- surface waves
|
|
|
Term
|
Definition
| A seismograph is an instrument that records the shaking of the ground. |
|
|
Term
| How many seismographs do you need to figure out where the epicenter of an earthquake is? |
|
Definition
|
|
Term
| What information do you need from seismographs to find the epicenter of an earthquake? |
|
Definition
| You need to know when the first primary wave arrives and when the first secondarly wave arries from seismographs at three different locations. |
|
|
Term
| Where can tsunamis get the energy to be so big? |
|
Definition
- earthquakes
- volcano erupting
- landslide
|
|
|
Term
| What is one way that earthquakes can change human habitats? |
|
Definition
- causing fires
- landslides
- soil changes
|
|
|
Term
| What are two ways to make small building in an earthquake zone safer? |
|
Definition
1. attach the building firmluy to their foundations
2. add supports to the walls |
|
|
Term
| What are some things earthquakes can do to change human and animal habitats? |
|
Definition
- fire
- tsunamis
- change soil
- landslides
|
|
|
Term
| How are fault and earthquakes related? |
|
Definition
| Movement at a fault can cause an earthquake. |
|
|
Term
| How are epicenter and focus related? |
|
Definition
| The focus is the place underground where rocks move. The epicenter is directly above the focus. |
|
|
Term
| How are seismic waves and seismograph related? |
|
Definition
| Seismographs measure the amount of energy in seismic waves. |
|
|
Term
| What causes earthquakes, and why do they form at faults? |
|
Definition
| Earthquakes happen when blocks of rock move. They are common along faults at plate boundaries because the blocks of rock move most there. |
|
|
Term
|
Definition
| The epicenter is where three circles meet. |
|
|
Term
| What kind of energy moves through Earth during an earthquake? |
|
Definition
|
|
Term
| What is the point on Earth's surface where the most damage from an earthquake occurs? |
|
Definition
|
|
