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4 years ago

What is plate tectonics?

2 answers:

7 0

Plate tectonics is the theory that Earth's crust is composed of many plates that are moving slowly over time.

Your answer is D. :)

Kazeer [188]4 years ago

6 0

What is plate tectonics?<span>a. The theory that Earth's surface does not change.
b. The theory that Earth's surface will eventually become hotter over time.
c. The theory that the thickness of Earth's crust will even out over time and become flat.
d. The theory that Earth's crust is composed of many plates that are moving slowly over time.

This is the theory of plate tectonics :D </span><span />

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This group has characteristics including: brittleness, insulators/poor conductors, and are often found as gases.

bagirrra123 [75]

Answer:

The answer is non-metals

Explanation:

6 0

3 years ago

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A metallurgist is making an alloy that consists of 325 grams of chromium (Cr) and 2.5 kg of iron (Fe). Find the total mass of th

Darya [45]

Answer:- Mass of the alloy is 2.8 kg.

Solution:- Mass of Cr in the alloy is 325 g and mass of Fe in the alloy is 2.5 kg. Mass of alloy would be the sum of masses of constituent metals.

Masses of the metals are not in the same units. So, we need to make the units equal. The want answer in kg so let's convert mass of Cr from g to kg.

Since, 1000 g = 1 kg

So, $325g\frac{1kg}{1000g}$

= 0.325 kg

Mass of alloy = mass of Cr + mass of Fe

mass of alloy = 0.325 kg + 2.5 kg = 2.825 kg

If we consider significant figures then as per the rules, the answer should not have more than one decimal place.

So, 2.825 kg is round off to 2.8 kg and hence the mass of the alloy is 2.8 kg.

5 0

3 years ago

Burning a piece of wood in fire can be best described as a chemical change because the atoms in wood change their state. physica

Phoenix [80]

The answeris c, chemicalchange because the atoms in woodand oxygen are rearranged.

6 0

3 years ago

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8. Write a balanced chemical equation showing how you could prepare each of the following salts from an

polet [3.4K]

Answer:

according to my reading

use own words

Explanation:

Salts are combinations of acids and bases. The cation comes from a base and the anion from an acid. Therefore, to make KNO3 we react KOH and HNO3. See how that is done? We write K and add OH to make KOH. We take NO3 and add H to make HNO3.

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3 years ago

Scientists Discuss time and how old the Earth is. How do they measure the idea

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3 years ago