The external structure of the Earth is primarily composed of ___ and seawater.

Rocks

True or False: Models of the Earth's internal structure are exact replicas of its layers.

False. Models are not exact replicas; they provide a simplified representation to aid understanding.

Fill in the blank: A model of the Earth's internal structure is analogous to ___ to reveal its layers.

Cutting open a peach

What is the primary purpose of models in science?

To help explain how things work or visualize structures that are not directly observable.

Riddle: I help you see what you cannot access, simplifying the complex into something you can grasp. What am I?

A scientific model

The visible surface of the Earth consists of which two main components?

Rocks and seawater.

What are the three main layers of the Earth?

The three main layers of the Earth are the crust, mantle, and core.

The thickness of the Earth's crust varies from approximately ___ km under oceans to ___ km under land.

The thickness of the Earth's crust varies from approximately 5 km under oceans to 70 km under land.

Fill in the blank: The mantle is significantly thicker than the crust, with an approximate thickness of ___ km.

3000 km

What substance is formed in the mantle due to high heat and melting of rocks?

Magma is formed in the mantle due to high heat and melting of rocks.

Riddle: I am a layer that lies beneath your feet, much thicker than the crust, and I melt rocks to create a liquid treat. What am I?

The mantle.

Short Answer: What is the maximum temperature that can be found in the mantle?

The maximum temperature in the mantle can reach up to 1000 °C.

Multiple Choice: Which layer of the Earth is the outermost layer where humans live? A) Mantle B) Core C) Crust D) Inner Core

C) Crust

What is the approximate thickness of the Earth's core?

The Earth's core is approximately 3400 km thick.

Fill in the blank: The outer core consists of ___ due to high temperatures and lower pressure.

Liquid metals

True or False: The inner core of the Earth is liquid due to high temperatures.

False: The inner core is solid due to the immense pressure from the overlying layers.

What are the primary metals that compose the Earth's core?

The Earth's core is primarily composed of iron and nickel.

Riddle: I am solid at the center, despite being very hot; immense pressure makes me strong, what am I?

The inner core of the Earth.

Fill in the blank: The temperature of the inner core is estimated to be around ___ °C.

6000

Multiple Choice: Which of the following temperatures is closest to the inner core's estimated temperature? A) 3000 °C B) 4000 °C C) 5000 °C D) 6000 °C

D) 6000 °C

Fill in the blank: Once erupted, magma is referred to as ___.

Lava