Scientists determine the composition of planets and stars by studying Earth's structure as a model, which has three main layers - an iron-nickel core, a mantle, and an outer crust composed of silicate, carbonate, oxide, and sulfide minerals. People have historically modified materials from nature like clay and metals to create tools and other items through techniques like firing pots and smelting bronze and iron.

2. How do we know what other planets
and stars are made of?

3. Spaceship Earth:

4. Erath is divided into three main regions:
the core, the mantle and the crust.

5. • The core is thought to consist largely of iron with
some nickel.

8. The crust is the outer solid shell of earth
often called the lithosphere.

9. The Lithosphere:

12. The lithosphere is compose of the
following rocks:
• Silicate minerals
• Carbonate minerals
• Oxide minerals
• Sulfide minerals

13. Thousands of mineral
compounds make up the
inorganic portion of the solid
crust and organic portion
makes up all living creatures.

14.  People long ago have modified nature’s
materials to satisfy their needs and
wants.
 Able to make pots using high
temperature
 Then able to make tools from bronze
later from iron.