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Question 1 of 5
Which layer is made up of iron and nickel?
A A. Crust
B B. Mantle
C C. Inner Core
D D. Asthenosphere
Why: The Earth's core, particularly the inner core, is primarily composed of iron (85%) and nickel (10%), with trace elements. The outer core is liquid iron-nickel alloy generating magnetic field. Crust is silicates; mantle is magnesium silicates. Thus option C is correct.
Question 2 of 5
What are the characteristics of the Earth's inner core? (Select all that apply in MCQ format)
A A. Solid iron-nickel
B B. Liquid state
C C. Radius ~1200 km
D D. Generates magnetic field
Why: Inner core characteristics: solid due to extreme pressure, mainly iron-nickel alloy, radius 1220 km, temperature 5200-5400°C. Magnetic field generated by outer core convection. B, D incorrect for inner core specifically. A and C correct, but standard MCQ selects primary composition.
Question 3 of 5
If Mr. Miller stands on the ___ and walks west, he will enter the Western Hemisphere.
A longitude
B latitude
C Equator
D Prime Meridian
Why: The Prime Meridian (0° longitude) divides the Earth into Eastern and Western Hemispheres. Standing on the Prime Meridian and walking west takes you into the Western Hemisphere (longitudes west of 0°). Options A, B, and C do not separate the hemispheres east-west.
Question 4 of 5
A ___ must be able to use lines of latitude and longitude to mark specific locations on maps.
A latitude
B cartographer
C longitude
D photographer
Why: A cartographer is a map maker who uses latitude and longitude coordinates to precisely locate places on maps. Latitude and longitude form the grid system for absolute location.
Question 5 of 5
What allows us to find locations north or south of the Equator?
A lines of latitude
B hemispheres
C relative location
D lines of longitude
Why: Lines of latitude (parallels) measure distance north or south of the Equator (0° latitude). They are parallel to the Equator. Longitude measures east-west.