Where did the system of Arabic numerals come from originally? To what regions did it spread after al-Khwarizmi wrote his book on the topic?

why do you think kush in nubia is not as well-known as egypt?

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts

the answer is c. hope this

the lines on a surface map are called isobars. isobars are lines of constant pressure which are measured in units called millibars. the numbers indicate the amount of air pressure, in millibars, that each line represents.