Answer:
D.
Explanation:
The refraction of P-waves in the inner core suggests that this layer is solid. P waves are able to travel through both liquids and solids, albeit not uniformly. Inge Lehmann observed this and predicted that the inner core of the Earth must be solid.
The outer core is known to be liquid, or at least partially liquid because S-waves cannot travel through that layer.
Answer:
Active citizenship refers to a philosophy espoused by organizations and educational institutions which advocates that members of charitable organizations, companies or nation-states have certain roles and responsibilities to society and the environment, although those members may not have specific governing roles.
Explanation:
Ample iron and coal resources are basic for industrial development.
Hi,
Note that the "British pound" isn't a unit of weight (lb.) but rather a unit of currency. By weight, the lb. is the same (British or American), though Brits usually use grams or kilograms rather than pounds, for weight.
The currency conversion from the British pound (£) is roughly equal to $1.22