Simple science worksheet helping students identify the Earth's internal structure through a labeled diagram and short quiz.

Let’s solve this step by step.

We are given three words to use: mantle, crust, and core.
We need to label the Earth diagram (which shows layers from outside to inside) and fill in the blanks for 3 sentences.

First, let’s remember what each layer is:

- The crust is the very outer layer — it’s thin, solid, and where we live. Oceans and continents are on the crust.
- The mantle is under the crust — it’s thick, hot, and made of rock that can flow slowly. It holds a lot of Earth’s heat.
- The core is at the center — it’s super hot, made mostly of iron and nickel, and part of it is molten (liquid metal).

Now, look at the diagram arrows (even though we can’t see them labeled, we know the order):

→ Outermost arrow = crust
→ Middle arrow = mantle
→ Innermost arrow = core

Now let’s match the sentences:

1. “The ________ is where we live, and where the oceans are.”
→ That’s the crust. We walk on it, oceans sit on it.

2. “The ________ is where most of the Earth’s heat is stored.”
→ That’s the mantle. It’s huge and holds tons of heat from inside Earth.

3. “The ________ is made of molten metal.”
→ That’s the core. Especially the outer core — it’s liquid metal!

So now we can fill in all the blanks correctly.

Final Answer:
1. crust
2. mantle
3. core