A concave mirror curves inward in the center. In this video, I use a laser to demonstrate ray of incidence, the ray of reflection,focal point,center of curvature, and the vertex

The Equinox is the date in which the day and night are equal. The Solstice is the longest day of the year? Because the Earth is tilted at a 23.5 degrees angle and also rotates and revolves around the earth the length of the day varies though out the year
During each equinox, both hemispheres receive almost equal amounts of sunlight
12 hours of daylight and 12 hours of nighttime.
Questions answered in this video?
What are the dates of the vernal equinox and the autumn equinox?
What are the dates of the summer solstice and the winter solstice?
What is the equilux?
When is the shortest day of the year?
When is the longest day of the year?

Have you ever wondered how you catch a cold? I discuss 5 ways microorganisms spread.
These include direct contact, indirect contact, airborne, oral route, insects and pests.

Learn how to create a stem and leaf plot. A stem and leaf plot is another method for organizing data so you can see patterns.
Draw the Stem and Leaf Chart
Identify the Stem
Sort your data and divide the numbers into a stem and a leaf
Provide a key

Mountain and Valley Breezes occur when the slopes of the mountain and the valley heat up and cool off at different rates. Valley breezes occur during the day and mountain breezes occur at night.

Learn the basics of Lichen and Moss. In many places on Earth, you will find Lichen and Moss living beside each other. Although they may look similar they are very different. Lichen are actually a symbiotic relationship between fungi and cyanobacteria. Moss are nonvascular plants.

When telling time there are different ways you can tell someone what time it is.
For example, when the small hand is on the three and the large hand is on the five could be called 3:05 o five past three.
In this video, I go over common phrases used when telling time.

Diffraction is the bending of light as it passes around the edge of an object or through a slit.
Refraction is the bending of a wave when it enters a medium where its speed is different.
When a wave passes through a slit it spreads out in waves as it passes through the slit.

Learn about the arctic and alpine tundra.
The tundra is a very cold and dry biome.The arctic tundra is found in North America, Asia, and Europe and circles the arctic ocean and stretches southward down to the taiga.The alpine tundra occurs at any latitude and is found at high elevations of 10,000 feet and
above.
The alpine tundra is found above the tree line and does not have any trees
Because of the high elevation, the alpine tundra has a climate and rainfall similar to the arctic tundra.

Confused about Science variables? In this video, I use 5 experiments in order to help you gain an understanding of Science variables. For example, which car cooler is the coolest temperature in the summer. The different colors are your independent variable and what you are measuring which is temperature is your dependent variable. Your control variables would be same location, measuring the temperature the same way.
Does eating bananas lower your blood pressure? What would be your variables in this experiment?

Cenozoic EraIn this video I would like to talk about the Cenozoic era on the geologic time scale.
The Cenozoic era is the most recent era and is part of the Phanerozoic Eon along with the Paleozoic and Mesozoic eras.
The Cenozoic era lasted roughly 65 million years.
The Cenozoic era is most often described as the “ age of mammals” but could also be called the
“Age of flowering plants” or the age of insects.
Let’s hit several highlights of this era
Although the first mammals appear in the Mesozoic era they begin to thrive during the Cenozoic era and spread throughout the world.
Birds become more diverse and becoming more diverse.
In addition flowering plants also begin to thrive and spread to all corners of the Earth
Along with insects.
Apes and Humans also appear
During this era, the Earth is cooler and ice ages occur and the formation of glaciers.
In addition, the continents have moved into their modern location and several mountain ranges including the Alps, Himalayas, and the Rocky mountains

In this video I cover different types of graphs and when they should be used.
For example, a bar graph is best or putting numbers in categories..

A Circle Graph is best to show different parts of the whole.
A Double bar Graph
can be used when you have two or more sets of data.
A Box Whiskers Plot is great to measures of variation
A histogram can show the frequency of data divided into intervals
A line Graph can graph change over time.
A line Plot can be used to show the frequency data on a number line

Video Guide
00:00 Introduction to types of graphs
1:01 When to use a Bar Graph
1:14 Line Graph can show data over time
1:26 A Circle graph shows parts of a whole.
1:43 Double bar graph is used to compare objects
2:03 When to use a histogram.
2:28 When to use a box and whiskers plot. It is helpful to show variation.
2:48 When to use a line plot.

Ocean stratification results when ocean water with different densities forms layers due to their properties. In this video, I show how differences in salinity can create ocean stratification which may result in ocean currents.
In the salinity demonstration, I have a container divided into two halves. On one side I have fresh water and the other I have very salty water. The two types of water are separated by a divider. When I lift the divider the salty water flows under the warm water and creates a current.

Learn how to calculate the volume of a hemisphere. You basically take the formula for the volume of a sphere and divide it by 2. The formula for volume is 4/3 pi radius cubed.

Learn how to calculate the surface area of a square pyramid.