Solve percent word problems. These word problems can be solved using part over whole equal percent over 100.
Example problems include,
Martin was given 10 math problems and has answered 7 of the questions. What percent of the problems does he have left?

The Braves won 60% of the 150 games they played. How many games did they win?

There are 32 students in Mr. B’s class. 28 students were present. What percent of Mr. B’s students were present?

Alkaline Earth Metals-- Alkaline earth metals are found in group 2 of the periodic table
They include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra)
The alkaline earth metals share several common properties, they have
Low density
Silver and soft metals
Ductile and malleable
React with halogens and water
Alkaline earth metals are reactive, not as reactive to alkali metals, but still very reactive. This is because they all contain two electrons in their outer shell. Because they are reactive they are usually found in nature in compound form.

Strontium compounds are often added to fireworks displays for their red flame test color.
Calcium is used by our body for our teeth and bones.
Magnesium is used in antacid and barium is used in light bulbs.
So there are the group 2 alkaline earth metals. They each have two valence electrons.
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What happens when you mix sodium and water?
Hint: It involves fire.
https://www.youtube.com/watch?v=YRPuDQtB_5Y&t=41s

What are the factors that allow the Earth to sustain life?
Life has been around for a long time. How does the earth help life on earth keep going and going and going.
I would like to look at three processes and one force that work together to help sustain life.
First, life is sustained by the flow of energy from the sun through the biosphere.
The biosphere is any location on earth that has life.
Plants contain chloroplasts which have the ability to convert sunlight into sugar.
Plants combine carbon dioxide, water and sunlight into glucose.
Animals eat plants and the energy from the sun is transferred to the animal.
Other animals eat these animals and the energy from the sun is spread throughout the ecosystem
The next process is the cycling of nutrients within the biosphere.
The earth has several biochemical cycles that recycle important chemicals
These cycles move chemical substance from the biotic and abiotic compartments of Earth. There are biogeochemical cycles for carbon, oxygen, nitrogen, phosphorus, sulfur, and water;
These cycles keep recycling these important chemicals so that we don’t run out of these chemicals.
Life has the ability to duplicate itself. It can be the offspring of two adults or bacteria that uses binary fission to rapidly make copies of itself.
Finally, gravity is the force of attraction between objects.
Gravity hold life on earth and also holds our atmosphere close to the earth.
The atmosphere contains important gases like oxygen which are essential to life.
Without gravity, the earth would not have an atmosphere and life as we know it would go away.
So there you go,
How life keeps going and going and going

What makes an arachnids an arachnid? Spiders and mites are examples of arachnids. First arachnids are arthropods and in addition, they have 8 legs, no antennae, and no wings.
Spiders are arachnids and come in a variety of sizes and shapes.
Spiders are not insects, but instead, they are Arachnids.
Although a spider and insect have many of the same traits spiders have only two body segments and eight legs instead of six.

An oblique triangle is a triangle without a 90 degree angle.
The form for area for an oblique triangle equals 1/2 b * c (sin A)
The equation gives us a way to find the area of the triangle without needing to find the height of the triangle.
This means we can find the area of oblique triangles without needing to create right triangles.

Learn what buoyancy is and Arhimedes principle.If you have ever tried to push a beach ball underwater you know how difficult this can be because the water pushes upward against the beachball. This upward force is called buoyancy.
Which is the ability of a fluid like water to exert an upward pressure.

If you drop an object in water which is a fluid then the water level will rise. In other words, the water will be displaced. The weight of this water that is displaced will be equal to the buoyancy force.

Archimedes principle in simple terms states that the buoyant force of an object is equal to the weight of the fluid displaced by the object.

Most air masses form over cold areas called polar regions or warm tropical areas.
In addition, they will form over oceans and be moist. Air masses that form over the ocean are called maritime and they form over continents. Air masses that form over continents are dry and are called continental air masses.
Remember air masses take on the conditions of where they are formed.
Let’s take a look at all of the air masses the Earth has
Maritime tropical are warm and moist
Maritime equatorial are hot and moist
Maritime polar cold and moist
Continental tropical warm and dry
Continental polar cold and dry
Continental arctic and Antarctica very cold and dry

Video of Jet Stream
Title: Aerial Superhighway.ogv
Author: NASA/Goddard Space Flight Center
Date: 24 January 2012

The cell membrane surrounds the cell and protects the cell, communicates with other cells, and controls what enters and exits the cell.
The cell membrane is made of phospholipids which have a polar and nonpolar end.
The cell membrane also has proteins and carbohydrates.
In this video, I cover what the cell membrane is made of and the structure and function of the cell membrane.

Layers of the Earth based on chemical composition and physical properties
Earth can be divided into three layers based on chemical composition: the crust, the mantle,
and the core.
Earth is also divided into layers based on physical
properties, such as whether the layer is solid or liquid.
The five physical layers are the lithosphere, asthenosphere,
mesosphere, outer core, and inner core.

A simple test to see if a number is prime or composite. All you do is find the square root of the number. Next, find all the prime numbers of this number. If none of these prime numbers are a factor of the number then the number is prime.

Types of Faults in Geology explained and animated.
In this video, I cover strike-slip fault, normal fault and reverse fault.