Divergent boundaries are boundaries where plates pull away from each other, forming mild earthquakes and volcanoes as magma comes to the surface. Convergent boundaries are boundaries where two plates are pushing into each other.

4 0

2 years ago

Find the 10th term of the geometric sequence 9,- 18, 36, ...

melamori03 [73]

Answer:

90 i think

Explanation:

$a^{1}$ = 9

$a^{2}$ = 18

d = ?

$a^{10}$ = ?

$a^{2} =a, + (n-1) d \\$

$18 = 9 + (2-1) d \\d=18-9 \\d=9$

$a ^{10}= a^{1} + (n-1)d \\\\a ^{10}= 9 + (10-1) (9)\\a ^{10}= 9+ (9 x 9)\\a ^{10}=9+8^{1} \\a^{10} = 90$

8 0

3 years ago

How fast does a continent move each year

STALIN [3.7K]

The moving of continents is called continental drift. The average speed of the movement of these continents are 2.5 inches per year. Examples would be t<span>he North American and Eurasian tectonic plates which are separated by the </span>Mid-Atlantic Ridge<span>. The two continents are moving away from each other at the rate of about 2.5 centimeters (1 inch) per year. </span>

8 0

3 years ago