Answer:
Elevation
Index contours
Contour interval
Explanation:
Contour lines on topographic connect points of equal elevation on the earth crust.
They are used to delineate the elevation of the landforms in an area.
Index contours are heavier lines on the topographic maps. They have numbers for specific elevation. The elevation of the index contour is used in extrapolating those of other places on the map.
The difference in elevation between contour lines is called contour interval. Most maps usually have consistent contour interval.
The elements listed in the choices are radioactive materials. These materials are very unstable because of the high neutron-to-proton ratio in the nucleus. Because of this, they spontaneously undergo nuclear reactions by giving off sub-particles in order to lower the ratio. They emit radiation in the form of alpha, beta or gamma.
Half-life is the length of time it needs to completely react half of the original amount. For example, it would take Bismuth 60.5 seconds to use up half of its amount. Therefore, the lower the half-life the faster the reaction is and the lesser the residual amount will be. With that being said, the answer would be Bismuth because it only takes seconds.
Answer:
my guess is because mountains are formed from earthquakes etc right? like convergent boundaries. so the two tectonic plates go towards each other like this -><- and they push each other upwards. over time, since the peaks are so high up, whethering carves the peak into a point.
<span>"C. one complete spin on its axis</span>" is the correct answer. One complete orbit around the sun by a planet would be referred to as a period of rotation. Periods describe one full movement.
