Basalt, formed from magma, contains iron-rich minerals. why is this important? a. iron is rich in nutrients and makes the soil easily identifiable. b. iron is one of most abundant elements and can be found on every continent. c. iron is magnetic and records the orientation and direction of earth's magnetic field. d. iron is magnetic and it triggers the reversal of earth's magnetic field.

What two advantages do the coastal countries of west africa have over the sahel countriesfertile soil and mineral resources temperatures and terrain human resources and natural resources weather patterns and location

Which are evidence of the seafloor spreading? a. molten material b. magnetic stripes c. continental material d. drilled core samples e. ocean water samples

Which barrier to economic development is shown in the following examples? i. the high rate of hiv infection in underdeveloped nations ii. the use of children as soldiers in uganda’s army in the early 2000s iii. low literacy rates in underdeveloped nations with limited exposure to adequate education a. foreign debt b. political instability c. widespread disease d. low levels of social welfare