GEOGRAPHY MIDDLE SCHOOL

California is one of the most seismically active regions in the world. Recently scientists published new calculations that reveal there is a 99.7 percent chance a magnitude 6.7 or larger earthquake will hit California in the next 30 years. Despite the new results, scientists still cannot predict exactly where in the state such an earthquake will occur or when.Why are scientists so sure about their predictions concerning the future California earthquake?
A) California has a long history of earthquakes.
B) California lies on a rift zone that is gradually opening wider.
C) California sits on top of two of Earth's major tectonic plates.
D) California lies in the middle of two convergent tectonic plates.

Answers

Answer 1
Answer: The answer is C. California sits on top of two of Earth's major tectonic plates... meaning that it is very likely for earthquakes to happen

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Why isn't the fit perfect it the continents were once part of Pangaea? Suggest at least 2 answers

Answers

It was possible that the theory of continental drifts caused water levels to rise, thus making the pieces of so-called Pangaea not fit perfectly. 

Another theory could be due to weathering and erosion of the continents to create a new shape of each continent.

Which of the following triangles are possible to draw?A triangle with angle measures of 30°, 60°, and 90°.

A triangle with angle measures of 20°, 50°, and 105°.

A triangle with angle measures of 100°, 40°, and 45°.

A triangle with angle measures of 55°, 35°, and 80°.

A triangle with angle measures of 25°, 65°, and 90°.

Answers

The triangles with angle measures of 30°, 60°, and 90°, and 25°, 65°, and 90° are possible to draw. Therefore, option A and E are correct.

What is triangle?

A triangle is a closed two-dimensional geometric figure with three straight sides and three angles. It is one of the simplest polygon shapes and is formed when three non-collinear points are connected by straight lines.

To determine if a triangle is possible to draw, we need to check if the sum of its angle measures is 180°. If the sum of the angle measures is less than 180°, then the triangle cannot close. If the sum of the angle measures is greater than 180°, then the triangle is not a triangle, as it has too many degrees. Here are the calculations for each of the given triangles:

  • A triangle with angle measures of 30°, 60°, and 90°:

30° + 60° + 90° = 180°, so this triangle is possible to draw.

  • A triangle with angle measures of 20°, 50°, and 105°:

20° + 50° + 105° = 175°, so this triangle is not possible to draw.

  • A triangle with angle measures of 100°, 40°, and 45°:

100° + 40° + 45° = 185°, so this triangle is not possible to draw.

  • A triangle with angle measures of 55°, 35°, and 80°:

55° + 35° + 80° = 170°, so this triangle is not possible to draw.

  • A triangle with angle measures of 25°, 65°, and 90°:

25° + 65° + 90° = 180°, so this triangle is possible to draw.

Therefore, only the triangles with angle measures of 30°, 60°, and 90°, and 25°, 65°, and 90° are possible to draw.

Learn more about triangle here:

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It has to be no.1 or no.5 because the numbers add up to 180 degrees.
The other options equal more or less than 180.

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