Question

section 2

1. describe the earth’s layers.
2. 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, solid layer (continental crust: thicker, less dense, granite - like; oceanic crust: thinner, denser, basalt - like). The mantle lies below the crust, is very thick (about 2900 km), and is mostly solid but has a semi - molten asthenosphere (allows tectonic plate movement). The core is divided into outer and inner core. The outer core is liquid (composed mainly of iron and nickel, and its movement generates Earth’s magnetic field), and the inner core is solid (due to extreme pressure, also iron - nickel based, at very high temperature and pressure).

Tectonic plate movements (plate tectonics) produce many large landforms. Convergent boundaries (e.g., oceanic - continental convergence: subduction of oceanic plate under continental plate forms mountain ranges like the Andes; continental - continental convergence: forms Himalayas). Divergent boundaries (e.g., mid - ocean ridges, rift valleys like the East African Rift). Transform boundaries (cause earthquakes and can form fault - related landforms, but major large landforms are more from convergent/divergent). Also, volcanic activity (related to plate boundaries or hotspots) forms volcanoes, volcanic mountains, and plateaus.

Answer:

The Earth has four main layers:

1. Crust: Outermost, thin (5 - 70 km thick), solid. Continental crust (thicker, less dense, granite - rich); oceanic crust (thinner, denser, basalt - rich).
2. Mantle: Below crust, ~2900 km thick, mostly solid with a semi - molten asthenosphere (enables plate movement). Composed of silicate rocks, temperature/pressure increase with depth.
3. Outer Core: Liquid, ~2200 km thick, iron - nickel alloy. Convection here generates Earth’s magnetic field.
4. Inner Core: Solid, ~1220 km radius, iron - nickel, extremely high pressure/temperature.

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