1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
likoan [24]
3 years ago
9

Which two elements are the most abundant in the Earth's crust? A. silicon and oxygen B. silicon and magnesium C. iron and nickel

D. iron and magnesium
Physics
2 answers:
mariarad [96]3 years ago
7 0

Answer: A. silicon and oxygen

Explanation:

The two most abundance elements in earth's crust are silicon and oxygen.

The most abundant element in earth's crust is Oxygen (O) which has a percentage composition of 46.6%.  Oxygen is mainly present as silicates, carbonates, sulphates etc.

The second most abundant element in earth's crust is Silicon (Si) which has a percentage composition of 27.7% . Silicon is present in the form of silicates.

The third most abundant element in earth's crust is aluminium (Al) which has a percentage composition of 8.1 %.

The fourth most abundant element in earth's crust is Iron (Fe) which has a percentage composition of 5.0 %.

Zigmanuir [339]3 years ago
7 0

Answer:

A

Explanation:

You might be interested in
(b) Released from rest at the same height, a can of frozen juice rolls to the bottom of the same hill. What is the translational
Oksanka [162]

Answer:

Explanation:

a) using the energy conservation  equation

mgh = 0.5mv^2 + 0.5Iω^2

I(moment of inertia) (basket ball) = (2/3)mr^2

mgh = 0.5mv^2 + 0.5( 2/3mr^2) ( v^2/r^2)

gh = 1/2v^2 + 1/3v^2

gh = v^2( 5/6)

v =  \sqrt{\frac{6gh}{5} }

putting the values we get

6.6 ^{2} = \frac{6\times9.8h}{5}

solving for h( height)

h = 3.704 m apprx

b) velocity of solid cylinder

mgh = 0.5mv^2 + 0.5( mr^2/2)( v^2/r^2) where ( I ofcylinder = mr^2/2)

g*h = 1/2v^2 + 1/4v^2

g*h = 3/4v^2

putting the value of h and g we get

v= = 6.957 m/s apprx

5 0
4 years ago
Do only number 3 and thank
IrinaK [193]

Charge = 0.2 Ah is the correct answer...

3 0
3 years ago
An exothermic reaction is taking place in a test tube what would you expect to feel when you touch the outside of the test tube
ValentinkaMS [17]

Answer:

Heat, Let me explain,

Explanation:

An exothermic reaction is like... Lighting a candle so it produces  a small amount of heat in less than a second and then normal heat.

7 0
4 years ago
What is global warming discuss its causes and effects?
Likurg_2 [28]

Answer:

“Global baking is a progressive increase in the earth’s hotness mainly on account of the dirtiness precipitated by raised levels of colorless odorless gas, CFCs, and additional contaminants. “

Causes and effects:

Global Warming is A Huge Problem for Our Planet, Threatening Biodiversity, Weather Patterns, and Human Health

5 0
2 years ago
If the moon is rising at midnight, the phase of the moon must be
Nadya [2.5K]
The phase is called 3rd quarter.

Hope this helps:)
7 0
3 years ago
Other questions:
  • You finally decide to take some liquid nitrogen from the physics lab and freeze the 1.5 pounds of beans which were sitting in yo
    6·1 answer
  • You want to use the idea of electromagnetic induction to make the bulb in your small flashlight glow; it glows when the potentia
    14·1 answer
  • a dart player throws a dart at speed of 12.9m/s. the dart hits the board 0.35m below the height from which it was theown. how fa
    8·1 answer
  • How do electromagnetic waves travel through medium
    5·1 answer
  • A common method to measure thermal conductivity of a biomaterial is to insert a long metallic probe axially into the center of a
    6·1 answer
  • 4. Explain the doppler effect. Be sure to talk about how the wave changes, the perceived change hear by a person that an emitted
    6·1 answer
  • Explain how electric motors convert electrical energy to mechanical energy​
    8·1 answer
  • A book weighing 18.0 N is lifted from the floor and placed on a shelf 1.5 m high. What is the minimum amount of work required to
    7·1 answer
  • This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Communication satellites
    10·1 answer
  • Anyone knows the answer to this?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!