1  2  3  4  5  6  7  8  9  10  time remaining01: 47: 17two lines intersecting at a right angleform a line. are parallel. are perpendicular. form a ray.

Two lines intersecting at a right angle are perpendicular.

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Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!