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Hiệu ứng nhà kính là một hiện tượng tự nhiên xảy ra khi các khí như CO2, CH4, N2O và các khí khác trong khí quyển bắt lại một phần nhiệt phát ra từ bề mặt Trái Đất, gây ra tăng nhiệt độ toàn cầu.
Hiệu ứng nhà kính gây tăng nhiệt độ toàn cầu, gây biến đổi khí hậu, ảnh hưởng đến môi trường sống và hệ sinh thái, gây nguy hiểm cho sức khỏe con người và gây mất đa dạng sinh học.
Hiệu ứng nhà kính:
+ hiện tượng trái đất nóng lên, do bức xạ sóng ngắn của mặt trời
+ do nguồn khí co2 tăng cao (do chặt cây, phá rừng, ô nhiếm môi trường, khí thải của các nhà máy, xí nghiệp, vv)
Ảnh hưởng của hiệu ứng nhà kính:
+ băng tan, mực nước biển tăng cao ->đất đai nhiễm mặn
+ xảy ra các hiện tượng thời tiết cực đoạn (bão, lũ, lốc xoáy,...)
+ hiệu ứng nhfa kính đã khiến trái đất nóng lên, một số sinh vật vì vậy không thể tồn tại được
+ nhiều loại bệnh tật mới xảy ra, làm ảnh hưởng đến đời sống và sức khỏe của con người
em vẽ hơi xấu tí, nhưng em vẫn hoàn thành được, mong cô thông cảm ạ :)))))
a.Cơ thể đơn bào: Vi khuẩn, Trùng giày
Cơ thể đa bào:Cây dâu tây, Chim bồ câu, Nấm, Con mực
b. 3 ví dụ về cơ thể đơn bào: vi khuẩn E.coli, trùng đế giày, trùng roi,...
3 ví dụ về cơ thể đa bào: con chó, con mèo, hoa cúc, ...
Trả lời: Quang năng của ánh sáng Mặt Trời biến đổi thành nhiệt năng làm nước nóng bốc hơi thành mây bay lên cao có thế năng; giọt mưa từ đám mây rơi xuống thì thế năng chuyển thành động năng; nước từ trên núi cao chảy xuống suối, sông ra biển thì thế năng của nước biển chuyển thành động năng.
Chúc học tốt!
Quang năng của ánh sáng Mặt Trời biến đổi thành nhiệt năng làm nước nóng bốc hơi thành mây bay lên cao có thế năng; giọt mưa từ đám mây rơi xuống thì thế năng chuyển thành động năng; nước từ trên núi cao chảy xuống suối, sông ra biển thì thế năng của nước biển chuyển thành động năng.
Olm chào em, cảm ơn đánh giá của em về chất lượng bài giảng của Olm, cảm ơn em đã đồng hành cùng Olm trên hành trình tri thức. Chúc em học tập hiệu quả và vui vẻ cùng Olm em nhé!
ko phải hay mà là thực sự hay và bổ ích đó bạn ạ!
Hình a: Khi đưa hai đầu của hai thanh nam châm đến gần nhau:
Khi hai thanh nam châm cùng cực thì đẩy nhau.
Khi hai thanh nam châm khác cực thì hút nhau.
Hình b: Khi bị đun nóng đường thì đường sẽ bị nóng chảy biến đổi thành chất khác là than và nước.
Hình c: Đem bình thủy tinh chụp kín cây thì sau một thời gian cây không thể tiếp tục phát triển bình thường và có thể chết vì thiếu oxi.
Hình d: Nhúng chiếc bút chì vào cốc nước thì ta thấy bút như bị gãy ở mặt nước. Bởi hiện tượng khúc xạ ánh sáng mà tia sáng từ đầu dưới nước của chiếc bút trên đường truyền từ vật vào mắt ta đã bị gãy khúc tại mặt phân cách giữa hai môi trường.
Hình a: Khi đưa hai đầu của hai thanh nam châm đến gần nhau:
Khi hai thanh nam châm cùng cực thì đẩy nhau.
Khi hai thanh nam châm khác cực thì hút nhau.
Hình b: Khi bị đun nóng đường thì đường sẽ bị nóng chảy biến đổi thành chất khác là than và nước.
Hình c: Đem bình thủy tinh chụp kín cây thì sau một thời gian cây không thể tiếp tục phát triển bình thường và có thể chết vì thiếu oxi.
Hình d: Nhúng chiếc bút chì vào cốc nước thì ta thấy bút như bị gãy ở mặt nước. Bởi hiện tượng khúc xạ ánh sáng mà tia sáng từ đầu dưới nước của chiếc bút trên đường truyền từ vật vào mắt ta đã bị gãy khúc tại mặt phân cách giữa hai môi trường.
vì khi chúng ta bật quạt, điện năng đã chuyển thành dạng năng lượng nhiệt năng khiến chúng ta thấy mát mẻ
bật quạt lên thì chúng ta sẽ được gió thổi đi hơi nóng trong người và nhiệt xung quanh người làm nhiệt độ trong người giảm xuống và chúng ta sẽ mát hơn
Vì khi cách quạt hoạc tay chuyển động sẽ làm cho không khí chuyển động tạo ra một luồng gió làm chúng ta cảm thấy mát mẻ hơn.
vì khi chúng ta bật quạt, điện năng đã chuyển thành dạng năng lượng nhiệt năng khiến chúng ta thấy mát mẻ
Vì quạt và quạt điện có thể tạo ra gió
em chịu rồi em mới có lớp 4
em mới lớp 5 nhưng em đã có giả thuyết rằng sau khi bật quạt , năng lượng trong chiếc ổ điện truyền vào dây quạt sau đó điện được truyền đã chuyển thành lượng hiệt năng và kích hoạt tất cả các bộ phận bằng năng lượng điện (nếu em sai cho em xin lỗi)
Thep em, quạt có thể làm chúng ta mát mẻ hơn vì khi đó, hướng gió sẽ thổi trực tiếp vào người của chúng ta, khiến ta mát mẻ
thì quạt nó quay nên mát nó tạo ra một lực gió
Vì khi ta bật quạt, cánh quạt làm cho không khí chuyển động sẽ tạo ra gió. Vì thế nên cơ thể của chúng ta cảm thấy mát
vì khi chúng ta bật quạt, điện năng đã chuyển thành dạng năng lượng nhiệt năng khiến chúng ta thấy mát mẻ
Em nghĩ ta sẽ không mát mẻ hơn là mấy vì hiện với cái nắng ở đây thì sẽ khiến không khí xung quanh ta tăng nhiệt độ lên rất nhiều và quạt chỉ tạo là luồng gió bản chất của nó chính là dùng không khí có trong không gian ta đang ở thổi vào ta => không khí ở đây khá nóng nên khi quạt vào thì ta cũng chỉ nhận được không khí nóng đó sẽ không mát hơn bao nhiêu khác với quạt ta có máy điều hòa khi này máy điều hòa sẽ thổi vào ta một không khí lạnh hơn chứ không dùng không khí ở đó nên 100% ta sẽ mát hơn khi dùng điều hòa. Tuy vậy quạt vẫn làm cho ta mát hơn 1 phần nào đó trong cái nóng này
ko thich bat thi lmsao
Vì khi chúng ta bật quạt, điện năng đã chuyển thành dạng năng lượng nhiệt năng khiến chúng ta thấy mát mẻ
Bởi vì khi chúng ta bật quạt, điện năng đã chuyển thành dạng năng lượng nhiệt năng tạo ra gió khiến ta thấy mát mẻ hơn
Vì quạt quay tròn sẽ có một lượng gió hút vào rồi thả ra
Vầng
Vầng trán rộng rãi và thành kính tri
Vì Quạt Có thể làm mát
Vì khi quạt bật lên, dòng điện chạy vào làm cho cánh quạt chuyển động và hút gió đẩy về phía trước làm chúng ta mát mẻ hơn
vì khi chúng ta bật quạt, điện năng đã chuyển thành dạng năng lượng nhiệt năng khiến chúng ta thấy mát mẻ
Vì khi bật quạt,năng lượng điện truyền vào.Năng lượng điện chuyển thành động năng làm quạt chuyển động quay tạo ra gió làm mát
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
Quạt làm chúng ta cảm thấy mát mẻ hơn nhờ vào các yếu tố sau:
Tuy nhiên, cần lưu ý rằng quạt không làm giảm nhiệt độ phòng mà chỉ giúp làm mát cơ thể. Bật quạt ở tốc độ cao trong môi trường nóng và khô có thể khiến cơ thể mất nước nhanh hơn và gây ra cảm giác khó chịu .