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
sammy [17]
3 years ago
7

What are blocks of time in the geological time scale called?

Chemistry
2 answers:
Katena32 [7]3 years ago
7 0
B is the answer , i got you
Nutka1998 [239]3 years ago
5 0

Ans: The blocks of time on the geological time scale are called eras

The history of evolution of life on earth is usually depicted in terms of geological time scale. The time scale has been divided by geologists and paleontologists into blocks referred to as 'era'. The 3 eras that have been currently identified are:

Paleozoic era which is the oldest and dates back nearly 540 million years

Mesozoic era which dates back to 250 million years ago

Cenozoic era which dates back nearly 65 million years

You might be interested in
List 4 things that can affect the rate of reaction during a chemical reaction.
laiz [17]

Answer:

Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.

Explanation:

6 0
2 years ago
PLEASE HELP!!
NARA [144]
We can skip option B and D because NaCl is salt and H₂SO₄ is a strong acid.
Neutralization reactions are those reactions in which acid and base react to form salt and water.
As water being amphoteric in nature can react with HCl as follow,

                           HCl  +  H₂O   ⇆  H₃O⁺  +  OH⁻

In this case no salt is formed, so we can skip this option.

Ammonia being a weak base can abstract proton from HCl as follow,

                              HCl  +  NH₃  →  NH₄Cl

Ammonium Chloride is a salt. So, among all four options, Option-C is the correct answer.
3 0
2 years ago
Read 2 more answers
What approximate percentage of the Earth’s freshwater is groundwater?
grigory [225]

the answer is c.) 30%

4 0
3 years ago
Read 2 more answers
Explain the factors that affect the separation of mixtures in amino acids
Elenna [48]
Consider you have a mixture of amino acids(contains all set of amino acids such as polar, non polar). Other than TLC, how are you supposed to separate a single amino acid from the mixture without loss of amino acid quantitatively.
6 0
3 years ago
The specific gravity of water is 1.0. True False
Zielflug [23.3K]
The specific gravity of water is 1.0 True 
5 0
3 years ago
Other questions:
  • A chunk of ice breaks off a glacier and falls 30.0 m before it hits the water. Assuming it falls freely (there is no air resista
    9·1 answer
  • Which shows the correct relationship?
    11·2 answers
  • Suppose you believe your unknown compound is NaOH, and you prepare 20 mL of a 0.1 mol/L solution of it. The stockroom provides a
    9·1 answer
  • Check all the statements that describe applications and properties of substances that result from intermolecular forces.
    10·2 answers
  • What is the approximate mass of 25 cm3 of silver, if the density is 10.5 g/cm3? A. 0.42 g B. 2.4 g C. 42 g D. 260 g
    8·1 answer
  • What important material is absorbed by your digestive system besides water
    12·2 answers
  • Why is global warming hazadous to earth's future
    8·2 answers
  • What is the difference between organic and non organic chemiatty?
    12·1 answer
  • 2.What two factors must be held constant for density to be a constant ratio?
    6·2 answers
  • What coefficient is needed in front of the H2O in the products in order to balance the equation?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!