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3 years ago

Has anyone done the Summer/Winter Gizmo? will award 25 points

Geography

1 answer:

dezoksy [38]3 years ago

7 0

Answer yes but what do you need help with?

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The Hadean was a time in Earth history when ________. A. the first abundant shelly organisms appeared in the fossil record B. Ea

FromTheMoon [43]

The Hadean era was before rocks were formed so I’d say b) . Hope this helps :)

3 0

3 years ago

The earth's first atmosphere (approximately 4.6 billion years ago) was most likely composed of ____.

Strike441 [17]

4.6 billion years ago - most likely hydrogen (H2) and helium (He)

probably rich in hydrogen compounds like methane (CH4), ammonia (NH3), hydrogen cyanide (HCN), water (H2O), and formaldehyde (HCHO). Also some N2, CO2 but LITTLE or NO free oxygen.

Molecules of H2 and He move really fast, especially when warm, that they eventually all escaped Earth's gravity and drifted off into space.

5 0

3 years ago

Read 2 more answers

Europe and asia are divided by

Vlad [161]

Aegean Sea, the Black Sea, the Caspian Sea and the Ural River

All water boundaries

My geography teacher was telling us as well it is known as the Eurasian boundary as well

3 0

3 years ago

If the star Alpha Centauri were moved to a distance 10 times farther than it is now, its parallax angle would ______

Virty [35]

Answer: get smaller

Explanation:

Parallax is the angle formed by the observation lines to a very distant object from two separated points.

The procedure to measure this distance in the case of a star, is based on observing it from two different places far away from each other, and then through trigonometry reach to the following relationship:

$d=\frac{r}{sin \theta}$ (1)

Where:

$d$ is the distance from Earth to the observed star (in Parsecs $1pc=206265AU$ )

$r$ is the earth-sun distance that is equivalent to an astronomical unit (1AU=150000000km)

$\theta$ is the angle of the parallax (in arc seconds $''$ )

Now, the distance to an object (measured in parsecs) is the reciprocal of the parallax (measured in arcseconds). Then, in its simplified mode, the stellar parallax is given by the following equation:

$d=\frac{1}{\theta}$ (2)

As we can see, there is an inverse relation between the distance $d$ and the parallax $\theta$ :

$\theta=\frac{1}{d}$ (3)

Hence, if the distance is increased by a factor of 10, the parallax is decreased by a factor of 10.

In other words, the parallax angle gets smaller.

8 0

3 years ago

When was French declared as a republic??

qwelly [4]

2. Magma is made of lava

7 0

3 years ago