The only shape that casts a round shadow no matter which direction it is pointed is a sphere, and the ancient Greeks deduced that this must mean the Earth is spherical.

Explanation:

5 0

3 years ago

Express the answer in scientific notation. What is the pressure, in N/m2, at a depth of 50 km in the continental crust?

julia-pushkina [17]

Answer:

1.422 $\times 10^9$ N/m²

Explanation:

pressure (P) = ρ g h

where ρ= density of continental crust

g= acceleration due to gravity

h is the depth given

density of continental crust is equal to 2.9 g/cm³

= $\frac{2.9\times 10^{-3}}{10^{-6} } =2.9\times 10^3 kg/m^3$

g=9.81 m/s²

height = 50,000 m

now,

pressure (P) = ρ g h

pressure (P) = $2.9\times 10^3\times 9.81\times 50000$

=1.422 $\times 10^9$ N/m²

6 0

3 years ago

Gm america

padilas [110]

Bruh what is going on

4 0

3 years ago

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Central and South America — List and describe a specific example of an ocean or river and how it was a barrier and/or roadway.

Vilka [71]

The Amazon River in South America served as a significant roadway through the centuries. For instance, the river allowed Orellana, a Spanish explorer in the 1500s, to spread Christianity to Amazon inhabitants. Explorers were able to travel up the entire river and return by the same route, which emphasizes the practicality of it as a travel method. Additionally, naturalists on these expeditions spread ideas through their findings on the Amazon. In conclusion, the Amazon River provided an effective path that encouraged the spread of global knowledge and beliefs.

4 0

3 years ago