Inside Earth Layers Quiz

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What property do magnets exhibit when facing like poles?

They attract each other.

They create a magnetic field together.

They do not affect each other.

They repel each other. (correct)

What type of force do magnets exert on each other?

Electromagnetic force

Gravitational force

Contact force

Non-contact force (correct)

Which rod becomes negatively charged when rubbed with wool?

Ebonite rod (correct)

Copper rod

Glass rod

Wooden rod

What happens to the suspended glass rod when brought near a charged ebonite rod?

It moves towards the ebonite rod. Signup and view all the answers

What is the nature of electrostatic force?

It can act on charged or uncharged bodies without contact. Signup and view all the answers

When two charged bodies are brought close, what is the effect of like charges?

They repel. Signup and view all the answers

What is an example of a non-contact force?

Magnetic force Signup and view all the answers

What happens when an uncharged body is brought near a charged body?

It experiences an electrostatic force. Signup and view all the answers

What is the primary composition of the earth's core?

Iron Signup and view all the answers

Which layer of the Earth is found between the core and the crust?

Mantle Signup and view all the answers

What type of rocks primarily make up the earth's crust?

Lightweight rocks Signup and view all the answers

What is the state of the outer core of the earth?

Liquid Signup and view all the answers

Which type of plates are found under oceans?

Oceanic plates Signup and view all the answers

What causes earthquakes to occur?

Movement of earth's crust plates Signup and view all the answers

How is the inner core of the Earth characterized?

It is solid and under high pressure Signup and view all the answers

What is the nature of the edges of the plates in the Earth's crust?

Rough Signup and view all the answers

What is the point on the earth's surface directly above the focus of an earthquake called?

Epicentre Signup and view all the answers

An earthquake of magnitude 3 on the Richter Scale is how many times stronger than an earthquake of magnitude 1?

Which magnitude on the Richter Scale is considered the minimum that can be felt by people?

1.5 Signup and view all the answers

What does an earthquake with a magnitude greater than 7 on the Richter Scale typically cause?

Severe damage Signup and view all the answers

How many times more destructive energy does a magnitude 6 earthquake have compared to a magnitude 4 earthquake?

What level of the Richter Scale is considered devastating?

8.5 or more Signup and view all the answers

What is a recommended precaution against earthquakes?

Taking precautions at all times Signup and view all the answers

Which earthquakes are categorized as really destructive?

Those above magnitude 7 Signup and view all the answers

What is the primary reason a ball rolling along the ground comes to a stop?

Frictional force Signup and view all the answers

Which type of force is friction classified as?

Contact force Signup and view all the answers

What happens when a bicycle stops being pedalled?

It comes to a stop due to friction Signup and view all the answers

Which of the following is an example of a non-contact force?

Magnetic force Signup and view all the answers

What effect does gravitational force have on objects thrown upwards?

It pushes them downward Signup and view all the answers

Which statement is true regarding the direction of frictional force?

It acts in the opposite direction to motion Signup and view all the answers

Which force is responsible for causing ripe fruits to fall from trees?

Gravitational force Signup and view all the answers

How does a non-contact force differ from a contact force?

It can act at a distance without touching Signup and view all the answers

What should be prioritized when constructing buildings in seismic zones?

Designing buildings to withstand major earthquake tremors Signup and view all the answers

Which material is preferable for construction in highly seismic areas?

Mud and timber Signup and view all the answers

What should be done with cupboards and shelves to ensure safety during an earthquake?

Fix them securely to the walls Signup and view all the answers

If an earthquake occurs while you are in bed, what is the safest action to take?

Stay in bed and move close to a wall Signup and view all the answers

What is a recommended practice for securing heavy objects in a home located in a seismic zone?

Mount heavy mirrors and frames securely to walls Signup and view all the answers

What should individuals do to prepare for potential fires after an earthquake?

Have fire-fighting equipment in working order Signup and view all the answers

What should be done with heavy objects during an earthquake to minimize risk?

Place them low to the ground Signup and view all the answers

How should individuals position themselves if they are near tall and heavy furniture during an earthquake?

Stay away from it Signup and view all the answers

Study Notes

Forces in Physics

Muscular force, applied through contact with an object, is categorized as a contact force.
Frictional force causes a moving object, like a rolling ball or bicycle, to gradually slow down and eventually stop.
Friction always acts in the opposite direction to the motion of the object.
Non-contact forces can operate without direct physical contact between interacting bodies, exerting push or pull from a distance.

Types of Non-Contact Forces

Gravitational Force:
- Causes objects to fall towards Earth due to Earth's pull, known as the force of gravity.
- Acts without physical contact, classifying it as a non-contact force.
Magnetic Force:
- Magnets attract iron objects and exhibit attracting or repelling interactions between like and unlike poles, operating at a distance.
- Represents another example of a non-contact force.
Electrostatic Force:
- Occurs when charged bodies exert forces on each other without direct contact.
- Positive and negative charges attract, while like charges repel, showcasing non-contact interactions.

Structure of the Earth

The Earth consists of three main layers: Core, Mantle, and Crust.
Core:
- Innermost layer made primarily of iron, extremely hot.
- Divided into outer core (liquid molten iron) and inner core (solid due to high pressure).
Mantle:
- Central layer containing solid and molten rocks.
- Composed of dense materials, serving as the transition zone between core and crust.
Crust:
- Outermost layer characterized by lighter rocks.
- Thicker under continents and thinner beneath oceans, consisting of tectonic plates (continental and oceanic).

Earthquake Occurrence

Earthquakes occur due to the movement of tectonic plates along boundary interactions:
- Plates can slide past or collide with each other, creating seismic activity.
Epicenter is the point directly above the focus (the earthquake's source).

Measuring Earthquakes

The Richter Scale quantifies earthquake magnitude from 1 to 12:
- Each whole number increase represents a tenfold increase in amplitude, with significant escalation in energy release.
- Earthquakes measuring above 7 on the Richter Scale are classified as destructive, and above 8.5 can be devastating.

Protection Against Earthquakes

Earthquake preparedness is crucial due to unpredictability:
- Buildings in seismic zones should be engineered to withstand earthquakes.
- Lighter materials (like mud and timber) are preferable for construction in high-risk areas.
Safety measures:
- Anchor cupboards to walls and place heavy items on lower shelves.
- Secure heavy objects to avoid falling during quakes.
Recommended actions during an earthquake:
- Seek shelter under sturdy furniture and protect your head.
- Stay clear of heavy furniture and glass windows.
- If in bed, remain still and protect your head with a pillow.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge of Earth's internal structure, including the core, mantle, and crust. This quiz will challenge your understanding of the composition and characteristics of these layers. Perfect for students studying Earth science.