Question

1. describe the earth’s layers. 4. what produced some of earth’s largest landforms?

Explanation:

Question 3: Describe the earth’s layers.

The Earth has several layers. The crust is the outermost, thin layer (continental: ~30 - 70 km thick, oceanic: ~5 - 10 km thick), made of solid rock (e.g., granite, basalt). The mantle lies below the crust, extending ~2900 km deep. It’s semi - molten (upper mantle: more rigid “lithosphere” and ductile “asthenosphere”; lower mantle: more solid due to pressure). The core is divided into outer and inner core. The outer core (~2200 km thick) is liquid, composed of iron and nickel, and its movement generates Earth’s magnetic field. The inner core (~1220 km radius) is solid, also iron - nickel, due to extreme pressure.

Plate tectonics (movement of Earth’s lithospheric plates) produces large landforms. Convergent boundaries (e.g., oceanic - continental subduction: forms volcanoes like the Andes; continental - continental collision: forms mountain ranges like the Himalayas). Divergent boundaries (e.g., mid - ocean ridges, rift valleys like the East African Rift). Transform boundaries (e.g., San Andreas Fault, but less for large landforms than convergent/divergent). Also, mantle plumes (hotspots) create volcanic islands (e.g., Hawaii) or plateaus.

Answer:

The Earth has four main layers:

• Crust: Outermost, thin (5–70 km thick), solid rock (continental: granite - rich; oceanic: basalt - rich).
• Mantle: Below crust, ~2900 km thick, semi - molten (upper: lithosphere/asthenosphere; lower: more solid), made of silicate rocks.
• Outer Core: Liquid, ~2200 km thick, iron - nickel, generates Earth’s magnetic field.
• Inner Core: Solid, ~1220 km radius, iron - nickel, due to extreme pressure.

Question 4: What produced some of Earth’s largest landforms?