Structure of the Earth
Grade 7 Science Worksheets
How the Earth is made up?
The Earth’s Crust
The crust making up the continents is constituted of granite and basalt rock makes up beneath the oceans. This is the outermost layer of Earth. The crust differs in varied thickness from 30 to 70 km under the continents and 5 to 15 km in the ocean levels. Beneath the mountains like the Rockies, Alps the crust is as thick as 100 km.
Schedule a Free session to clear worksheet doubts
No credit card required, no obligation to purchase.
Just schedule a FREE Sessions to meet a tutor and get help on any topic you want!
What are all the layers of the earth?
It is the second layer made of two parts, upper and lower, the thick layer is made of extremely hot, semisolid rock is beneath the crust and is about 2,900 km thick made up of iron and magnesium.
The core is two times thicker when compared to the mantle. The outer core is the only liquid layer, an ocean of mostly iron and nickel alloy. It is about 2,300 km thick. The liquid outer core controls most of the earth’s magnetic field, making the spinning action possible as the Earth rotates. The core is extremely hot and pressure here is very high, that is why the iron and nickel is in liquid form. The inner core is mainly iron in molten form.
Lithosphere is one of the four spheres of earth and is made up of the crust and a very little of the upper mantle, this layer is divided into several very slowly moving plates of solid rock that hold the continents and oceans.
The upper mantle makes the plates of the lithosphere move on this hot, liquid magma right below the lithosphere.
The plate tectonics theory, says that the earth’s outer layer, or lithosphere, is broken into several large pieces called plates.
These are tectonic plates, which hold the continents and oceans and are slowly but constantly moving on the Earth’s surface. The movement of the plates proves that the continents are not fixed and had moved over time, and also describes how and why earthquakes, volcanoes, and other events occur in Nature.
A plate boundary is where these tectonic plates meet. These are of different kinds depending on the movement they make.
- Convergent plate boundary – Crashing towards each other
- Divergent plate boundary – moving away from each other.
- Transform plate boundary – slides against each other.
Learn more about Structure of the Earth and other important topics with 7th Grade Science Tutoring at eTutorWorld. Our expert science tutors break down the topics through interactive one-to-one sessions. We also offer the advantage of customized lesson plans, flexible schedules and convenience of learning from home.
eTutorWorld Understands Math Tutoring | Online Math Worksheets are Important Tools
Understanding graphs, charts, and opinion polls in a newspaper, for calculating house and car payments, and for choosing a long-distance telephone service are impossible without strong math skills …and the only way to develop strong math skills is by constant practice.
‘Practice makes a man perfect’ holds true for no other field better than for math. A middle or high school student must set aside a minimum of an hour for math every day. Other than textbooks, worksheets help you revise and understand concepts better.
Our expert tutors prepare online maths worksheets that are age and grade-appropriate. Grade-wise math worksheets for Elementary Math, Arithmetic, Pre-Algebra, Algebra, Geometry, Trigonometry, Statistics, Pre-Calculus and Calculus can be solved to improve math skills, to get ahead or to even catch up.
You may download these FREE online math worksheets in the PDF format, and then print and email us their solutions for a free evaluation and analysis by eTutorworld’smath expert tutors.
You may solve these worksheets by yourself or with your peers while studying together.
The Answer Key at the end of each worksheet allows for a self-evaluation.
Personalized Online Tutoring
eTutorWorld offers affordable one-on-one live tutoring over the web for Grades K-12, Test Prep help for Standardized tests like SCAT, CogAT, MAP, SSAT, SAT, ACT, ISEE and AP. You may schedule online tutoring lessons at your personal scheduled times, all with a Money-Back Guarantee. The first one-on-one online tutoring lesson is always FREE, no purchase obligation, no credit card required.
For answers/solutions to any question or to learn concepts, take a FREE CLASS.
No credit card required, no obligation to purchase.
Just book a free class to meet a tutor and get help on any topic you want!
I. Explain the following:
- What is the Crust made up of?
- What makes up the core?
- What do you understand by plate boundary?
- What is the basic composition of the mantle?
- What is the Lithosphere?
- The crust is made up of granite on the continents and basalt rock makes up beneath the oceans.
- The outer core is iron and nickel and the inner core is mostly iron.
- A plate boundary is where these tectonic plates meet.
- Mantle is basically a composition of iron and magnesium.
- Lithosphere is made up of the crust and a very little part of the upper mantle, this layer is divided into many slowly moving plates of solid rock that hold the continents and oceans above.
Pricing for Online Tutoring
|Tutoring Package||Validity||Grade (1-12), College|
|5 sessions||1 Month||$139|
|1 session||1 Month||$28|
|10 sessions||3 months||$269|
|15 sessions||3 months||$399|
|20 sessions||4 months||$499|
|50 sessions||6 months||$1189|
|100 sessions||12 months||$2249|