ozonosphere
ionosphere
exosphere
c. older than
b. the same age as
d. not related to
Limestone is a sedimentary rock composed primarily of skeletal fragments of marine organisms. The presence of fossils reveals the biological origin of these rocks.
A limestone bed containing fossils that are 550 million years old is older than a bed of sandstone containing fossils that are 400 million years old.
b. longwalls
c. native minerals
d. ore minerals
Answer:
the center of the earth, the north and south poles, the equator and the Prime Meridian.
Explanation:
To obtain a precise latitude, map makers use 4 universal well-known points of reference that make unanimity among the science community, to ensure consensus.
Those reference points are:
1.) the center of the earth: that is used to calculate the radius of the circles and the various angles to draw the latitude lines.
2). the north and south poles: since the latitude lines have to reach them, starting from the Equator.
3.) the equator: that's latitude 0, so it's a pretty important reference point.
4.) the Prime Meridian, as a perpendicular line for the latitude "rings" and other calculations.
And the same reference points are also used to calculate the longitudes as well.
b. Bab al-Mandab
c. Tigris
d. Wadi
Answer:
the answer is C
Explanation: