What heats the mantle?

A. radiation in the crust heats the mantle through convection

B. convection in the crust heats the mantle through conduction

C. radiation in the core heats the mantle through conduction

D. convection in the core heats the mantle through conduction

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

How have the greenhouse gasses increased from the year 2000 to 2018